Twitter just announced some big changes around political ads

Twitter will now label political ads with sponsors, including spending and targeting disclosures, and establish a Transparency Center database with all ads  

Electioneering ads are those that refer to a clearly identified candidate (or party associated with that candidate) for any elected office.* To make it clear when you are seeing or engaging with an electioneering ad, we will now require that electioneering advertisers identify their campaigns as such. We will also change the look and feel of these ads and include a visual political ad indicator.

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