Twitter wants to know when your birthday is, so it can shower you with animated balloons (yay!), and better target you with ads (boo!). The social network today introduced the option for users to set their birthdate in its settings menu and have it appear on their profile. Twitter says the new feature will allow people to celebrate your birthday more effectively, sending you all-important #HBD tweets to commemorate the anniversary of your existence, but its introduction also has a less altruistic side — it will help the social network work out which ads it thinks you want to see.

Last week Twitter introduced new audience insights for brands that allowed them to choose groups of users — including millennials, seniors, college grads — at…

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