When Facebook said it was hiring 1,000 more people to manually review ads, it wasn't necessarily clear to everyone what that entailed -- just what was the focus, and would it affect upstanding advertisers? While the company touched on what whats happening before, there's no ambiguity now. According to Axios, Facebook is telling advertisers that it now requires manual review for ads targeting people based on "politics, religion, ethnicity or social issues." In other words, Facebook is determined to avoid any attempt to use ads to stoke social tensions, even if that means slowing down its ad system. The social network warns marketers that they're "likely to experience a delay" to the start of their ad campaigns, at least until Facebook finds a way to streamline the process.