Facebook pulled down, but then restored, some of the ads placed by the campaign of presidential candidate Sen. Elizabeth Warren that called for the of Facebook, Amazon and Google.
"We removed the ads because they violated our policies against use of our corporate logo," a Facebook spokesperson said in a statement Monday. "In the interest of allowing robust debate, we are restoring the ads."
The Democratic lawmaker from Massachusetts announced herlast week to break up the tech giants, arguing in a blog post that they've "hurt small businesses and stifled innovation."
Facebook, which has more than 2 billion users around the world, owns other popular tech platforms, including photo-sharing site Instagram and messaging app WhatsApp, and Warren has argued the company has become too powerful.
Politico first spotted the removal of Warren's ads on Monday and reported that three of them had been pulled down for violating Facebook's rules.
"Three companies have vast power over our economy and our democracy. Facebook, Amazon, and Google," the ads read. "We all use them. But in their rise to power, they've bulldozed competition, used our private information for profit, and tilted the playing field in their favor."
Not all of Warren's presidential campaign ads were affected. Facebook's database of political ads show that the ads are currently running on the social network.
Warren's office pointed to a tweet from the senator when asked for a comment.
Originally published March 11 at 5:00 p.m.
Updated at 5:16 p.m.: Includes tweet from Sen. Warren.