Meanwhile, Twitter's "Transparency Center" will allow anyone to look up details on all the ads running on the platform, the length of time those ads have been live, and more. For political ads, the hub will show past and present ads, how much has been spent on an ad campaign, and who is paying for the ads, along with demographics being targeted. Tweets promoting an EU candidate or party will also carry an icon to help distinguish them from regular posts.

In October 2017, a BuzzFeed report revealed that 13,000 bots had waged a pro-Brexit Twitter campaign in the lead up to the referendum. In February 2018, facing mounting pressure from the UK parliament, Twitter fessed up that 49 Russia-linked accounts had tried to sway Brexit voters. Twitter introduced its ads database shortly after Facebook released its own set of guidelines on political ads (which also came to Europe earlier this year).