"All this will improve detection of what qualifies as questionable content," the site said, adding, "we will continue to work aggressively on this issue with advertisers."
The changes will not impact Facebook's business, the company said.
Facebook's revenue is derived almost entirely -- 84 percent in 2012 -- from ads.
Other ad-dependent companies are also grappling with how to deal with questionable content. Google has recently made moves to remove adult-themed blogs on its Blogger platform that also have adult advertisements.