Facebook Hypocrite or FaceCrite
A FaceCrite is when someone goes all in on a group or fan page, then flips their lid and joins the exact opposite, like they have a split personality and it's caused by a bad Facebook update.
I joined the 'I Love Dogs' group, then I joined 'I Hate Cats' because I had a bad day.
She became a fan of 'Fitness Enthusiasts,' then she joined 'Bread and Butter Lovers' because she couldn't handle crunches.
He liked 'Peace Lover,' then he joined 'War Enthusiast' because someone said something stupid.