Facebook groups and campaigns. Twitter ads. Ads on YouTube, on Gmail. Promotions on Pokémon Go?! And now Outbrain, one of the companies responsible for those ubiquitous content recommendations no one ever thought they needed, is investigating whether Russia-linked groups purchased ads on its platform to somehow meddle in the 2016 U.S. elections, according to a BuzzFeed News report on Tuesday.

Outbrain is “currently conducting a thorough investigation specific to election tampering and continue[s] to monitor our index,” the company said in a statement to BuzzFeed News.

“The attempt to spread misinformation that impacts elections is obviously very concerning to us,” the Outbrain statement said. “Outbrain has been proactive in combating fake content in the past.”

“After a thorough investigation, Outbrain has found no evidence of bad actors using our platform to influence elections,” Outbrain CEO Yaron Galai said in a statement forwarded to Nieman Lab on Wednesday. “Given the seriousness of this issue and out of an abundance of caution, we proactively undertook this effort over the course of many weeks to ensure we got it right. Outbrain has always been dedicated to combating fake content, and we remain vigilant in fighting those who attempt to misuse our platform.”

Other similar ad networks like Taboola and RevContent told BuzzFeed on Tuesday they’ve seen no evidence of Russia-linked ad purchases.

These companies aren’t exactly beloved by users, but they drive enough revenue that some news organizations are keeping them around. Outbrain, for instance, claims its content reaches 550 million visitors each month, and its VP of product marketing claimed to The New York Times last year that the widget has become a “No. 1 revenue provider” for “major, major publishers.” A small number of publishers including Slate and The New Yorker dumped these networks last year, but major publishers from The Washington Post to ESPN continue to use these recommendation widgets that display bad clickbait — and misinformation — on their article pages (see: “Why Doctors Will No Longer Prescribe Blood Pressure Meds,” “Angelina Jolie’s Daughter Used to Be Cute. Now She Looks Insane”).

Examples of US election content pushed by Outbrain and others:

“Rare Unseen Photos Of Hillary Clinton They Don’t Want You To See” pic.twitter.com/d3Jgmk6flm

— James Temperton (@jtemperton) October 17, 2017

Periodic reminder that when you put Outbrain or Taboola on your site you endorse:
Fake news
sexism
ageism
racist
dumbfuckery pic.twitter.com/vSy47g1AZZ

— Clara Jeffery (@ClaraJeffery) October 13, 2017