That would fall to the Federal Election Commission. But the FEC is charged with enforcing regulations that were last changed in 2006. Facebook was two years old then, Twitter had yet to develop a retweet function, and Instagram didn’t exist.

Moreover, “commission regulations do not explicitly address social media influencers,” Myles Martin, an FEC spokesperson, said in an email. That leaves it up to campaigns to interpret old regulations as they please, and no real investigative enforcement body overseeing them.

FEC guidelines do state that public communications that “advocate the election or defeat of a candidate for federal office and placed on the Internet for a fee must include a disclaimer” informing who paid for the communication.