In a blog post on Thursday, Vine announced that it had updated its terms of use to prohibit sexually explicit content from appearing on the service. The outright ban is the culmination of the service’s longstanding uneasiness with porn. Practically since launch, Vine has been trying to figure out how to handle adult content. Three days after it launched at the start of 2013, John Biggs of TechCrunch wrote about “Vine’s Porn Problem,” noting that searching for #porn delivered, well, porn, as if that’s some sort of big surprise.