Unsubstantiated rumors and outright falsehoods spread widely in immigrant communities ahead of the presidential election in 2020. That is happening again in the run-up to this year’s midterm elections, researchers say, but with an insidious twist: The social media accounts pushing misinformation are now targeting audiences in more languages on more topics and across more digital platforms, with scant resistance from social media companies.In recent weeks, posts exaggerating the fallout from inflation have been aimed at Americans from Latin American countries that have been crippled by poor economic management. Conspiracy theories that spread in August about the Internal Revenue Service’s plans for a “shadow army” led mentions of “Ejército IRS” to surge alongside “IRS army,” its equivalent in English, according to the research group Zignal.Misinformation swirling in Chinese on Twitter, YouTube and WeChat about mail-in ballots, school curriculums and hate crimes “has dangerous implications” this year for Asian American voters, who are growing as a political force, according to the advocacy group Asian Americans Advancing Justice.“There’s definitely a hyper-targeting of messaging,” said Nick Nguyen, a co-founder of Viet Fact Check, a group that offers explanations about misinformation circulating among Vietnamese Americans. “This is where a lack of English-language fluency can make populations vulnerable.”Viet Fact Check is among a growing number of groups trying to contextualize and debunk false online narratives in languages other than English. Factchequeado, a six-month-old Spanish-language service, is examining inaccurate translations, manipulated images and misleadingly edited videos about the search of Mar-a-Lago and Speaker Nancy Pelosi’s visit to Taiwan. Desifacts, which focuses on South Asian American communities, began publishing explainers and clarifications about topics such as immigration and student debt relief in Hindi, Bengali and Tamil in February.Viet Fact Check is among a growing number of groups trying to battle false online narratives in non-English languages, but it can be hard to keep up with the flood of misinformation.Jim Wilson/The New York TimesBut the multilingual fact checkers say they cannot keep pace with the deluge of falsehoods online. They have called on the big social media platforms, like Facebook and YouTube, to do more for efforts in other languages as they would for misinformation in English.The State of the 2022 Midterm ElectionsWith the primaries over, both parties are shifting their focus to the general election on Nov. 8.The Final Stretch: With less than one month until Election Day, Republicans remain favored to take over the House, but momentum in the pitched battle for the Senate has seesawed back and forth.A Surprising Battleground: New York has emerged from a haywire redistricting cycle as perhaps the most consequential congressional battleground in the country. For Democrats, the uncertainty is particularly jarring.Pennsylvania Governor’s Race: Attacks by Doug Mastriano, the G.O.P. nominee, on the Jewish school where Josh Shapiro, the Democratic candidate, sends his children have set off an outcry about antisemitic signaling.Herschel Walker: The Republican Senate nominee in Georgia reportedly paid for an ex-girlfriend’s abortion, but some conservative Christians have learned to tolerate the behavior of those who advance their cause.“With mis- and disinformation in Spanish, we feel like we are fighting a giant,” said Tamoa Calzadilla, Factchequeado’s managing editor and the former head of Univision’s fact-checking operation. “It’s frustrating because we are trying to do something, and we need support from the platforms — we are doing our work, but Big Tech can do more.”The social media companies said they moderated content or provided fact-checks in many languages: more than 70 languages for TikTok, and more than 60 for Meta, which owns Facebook. YouTube said it had more than 20,000 people reviewing and removing misinformation, including in languages such as Mandarin and Spanish; TikTok said it had thousands. The companies declined to say how many employees were doing work in languages other than English.TikTok has translated a midterms information hub on its app into more than 45 languages. Twitter has a similar elections center available in English and Spanish, along with prompts that debunk and “pre-bunk” misinformation in different languages. Meta said that it had invested in initiatives such as Spanish fact-checking services on WhatsApp in preparation for the elections and that it would show voting-related notifications in both English and a second language based on users’ activity.The companies also cited broader improvements. Meta said its Spanish misinformation prediction models in the United States were now working on a par with its English-language models and had significantly increased the amount of Spanish content sent to fact checkers for review. Twitter said its newly redesigned contextual labels, which are translated based on users’ language settings, had helped shrink engagement with misinformation. YouTube said information panels now appeared in different languages for certain search results and videos. It also highlights content from vetted non-English news sources based on users’ language settings and search queries, the company said.Tamoa Calzadilla is the managing editor of Factchequeado, an organization dedicated to examining inaccurate Spanish translations. Eva Marie Uzcategui for The New York TimesBut researchers worry about the effect of non-English misinformation on the coming vote, saying lies and rumors in other languages continue to seep through. A report released Monday from the watchdog group Media Matters found 40 Spanish-language videos on YouTube that advanced misinformation about U.S. elections, including the false notion that fraudulent ballots were coming into the United States from China and Mexico.Some disinformation experts, along with some elected officials, have pressed the social platforms for more action and transparency.This year, the Congressional Hispanic Caucus pushed Meta, TikTok, YouTube and Twitter for meetings with their top executives to discuss the spread of misinformation in Spanish. YouTube made its chief executive, Susan Wojcicki, available; TikTok and Twitter sent other executives. The caucus and Meta were unable to schedule a meeting, and Meta said it planned to instead submit a written update.An example of the kind of post Factchequeado seeks to debunk, shown on Ms. Calzadilla’s laptop. The organization placed a stamp that reads “Falso” over this misleading image.Eva Marie Uzcategui for The New York TimesThe International Fact-Checking Network at Poynter sent an open letter to YouTube in January, describing the ease with which misinformation on the platform was flowing across borders. Researchers have said the same narrative often emerges on different sites in different countries, and then cross-pollinates in a feedback loop that makes it seem more believable. As one fact checker argued, an immigrant is more likely to trust a conspiracy theory voiced by both the person’s mother in El Salvador and a friend in San Francisco.Misinformation can also do what researchers call platform-jump — originate in English on fringe services like Truth Social or Gab and then emerge later on more mainstream sites, presented in a different language or sometimes with a misleading translation attached.Alethea Group, which helps corporations guard against disinformation, recently looked at seven YouTube channels that were based in Colombia but appeared to target conservative Spanish speakers living in or tied to the United States. Researchers found that the channels often took false or misleading narratives from conservative or foreign state media, repeated it on YouTube in Spanish, and then sometimes pointed viewers to platforms like Twitter and Telegram, where the translated content continued to spread. Sometimes, the channel operators tried to monetize the videos through ads or requests for donations or subscriptions.Alethea found that one account with more than 300,000 subscribers repurposed and translated existing unsubstantiated narratives that the F.B.I. had deliberately planted documents at Mar-a-Lago to entrap former President Donald J. Trump, according to the report. The title of one video was “S4LE LA V3RDAD” instead of “sale la verdad” (the truth comes out), which Alethea researchers believe may have been a potential attempt to evade YouTube moderators. Other researchers have discovered accounts, previously terminated by platforms for violating misinformation guidelines, that reincarnated under different aliases.A post translated into Spanish on Telegram repeated former President Donald J. Trump’s false claim that documents were thrown haphazardly on the floor.Dominik A. Stecula, an assistant professor of political science at Colorado State University and an immigrant from Poland, attributed the spread of multilingual misinformation online in part to the slow decline of local ethnic media outlets covering community issues.“People don’t want to pay for content, and as a result, a lot of these institutions are falling apart,” Mr. Stecula said. “What replaces them is just some dude in Arizona with a high-definition camera and a microphone.”Mr. Stecula noted how moderation was complicated by cultural nuances and diverse communication preferences, explaining that while immigrants from Asia tend to prefer WhatsApp, people from Poland often gravitate toward Facebook.Some experts, skeptical that all multilingual misinformation can be removed, push instead for other ways to limit amplification. Last year, Twitter tested a feature that allowed some users in the United States, South Korea and Australia to flag tweets as misleading.Evelyn Pérez-Verdía, the head of strategy at the consulting firm We Are Más, in South Florida, estimated that tens of thousands of people followed Spanish-language channels on Telegram that promote the QAnon conspiracy theory. She said she had learned about one group, with nearly 8,000 subscribers, from her Colombian American hairstylist.She said such groups have been “very smart to make sure the message is tailored based on culture and subculture,” sometimes exploiting symbols like the raised fist, which can represent hope and solidarity to younger people born in the United States while reminding older immigrants of leftist Latin American dictatorships. Posts have blended anti-communist sentiment with conspiratorial QAnon language, calling President Biden “el Lagartija” (the Lizard) while describing his party as “Demoniocratas” (Demon-Democrats).“It’s not only about misinformation or disinformation — there also needs to be a responsibility to understand that words and symbols mean different things to other communities,” Ms. Pérez-Verdía said. “It doesn’t matter if you’re from Vietnam or from Colombia — most people see the prism of the politics of our nation through the prism of the politics of theirs.” More