The head of Facebook's Messenger application, David Marcus, on Wednesday said that nefarious activity on social media sites is just a reality for such platforms.

“When you design a platform that reaches two billion people every month, sometimes bad things happen,” Marcus said during the Wall Street Journal’s D.Live conference, according to Fortune. “We shouldn’t tolerate those things or let them happen.”

Marcus acknowledged that a few Facebook accounts that were linked to Russian groups, possibly to influence the 2016 presidential election, had used the Messenger platform.

He argued that platform has limitations that kept it from being an effective tool for Kremlin-linked groups.

“When you are a page, for instance, you cannot message people. People have to message you,” Marcus said. ADVERTISEMENT

The Facebook executive said the company’s investigation of possible election interference is still “active” and says he is frustrated with the attention the company has been receiving over its use by Russia-linked groups.

“The narrative about Facebook as of late has not been super positive,” Marcus said. “The impact that Facebook has in the world — we don’t talk about it anymore. It’s overshadowed by this narrative.”

Marcus’s comment echoes Facebook CEO Mark Zuckerberg’s previous comment about election interference in which the CEO said the company can’t stop all bad behavior on the platform, but will try to stop what it can.

“Now, I'm not going to sit here and tell you we're going to catch all bad content in our system. We don't check what people say before they say it, and frankly, I don't think our society should want us to,” Zuckerberg said during an announcement of Facebook strengthening its advertising policies.

The company has said that it will employ an extra 1,000 human editors to review and remove ads that violate its policies.