What’s happening: To break the seemingly never-ending political deadlock over Brexit, the UK’s citizens are going to the polls on December 12 to vote in a general election.

The tactics: As in the last UK election, just two years ago, targeted ads on social media will play a big role as the major parties try to convince wavering voters or shore up their own support. This time around, however, Facebook has a clearer (and more controversial) stance on what it will and won’t allow on its platform. Specifically, it’ll be the first major election where its policy of letting politicians lie in ads is put to the test, a stance that has come under increasing pressure since Twitter said it would ban political ads last week.