https://www.cnbc.com/2017/10/24/twitter-will-label-political-ads-including-who-bought-and-spend.html

As political pressure mounts on social media companies to say where ads are coming from, Twitter will reveal more information about political advertising on its platform.

Twitter said in a blog post on Tuesday it would clearly label political electioneering ads, which the Federal Election Commission (FEC) defines as an ad used to promote a specific candidate for elected office or affiliated party posted within 30 days of a primary election or 60 days of a general election. Electioneering ads can also include any ad clearly promoting a political candidate at any time.