Among the accounts Perry is following:
@jooeejonass (dedicated to re-tweeting Joe Jonas, apparently)
@StayWithDemi_BU "This acct is to help get @ddlovato (Demi) to tweet @dd_lovatoislove on her birthday!! Everyone sign the link above please and help spread the word!"
@demisel_rocks "i am crazy fan of all disney celebs especially selena demi jonas and taylor swift they are my lyf."
@agusjazzybieber (Don't look or you'll be mesmerized by the flash background)
@notddlovato (In case you thought it was the real Demi Lovato, we guess)
@ jbieberluv823 (alas, it's locked)
@ElifJBieber (also locked)
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Obviously, if you choose to follow Perry he'll follow you. But FWIW, as they say in Twitterland, TX$BillWhite seems to be a relatively tween-free zone.
Keep that in mind come election day, Bieber-lovers.