Speaking as a different stripe: I'm signed up for that group. It amuses me and mocks the whole idea of signing up for Facebook groups. I don't consider it activism in the least to join a goofy Facebook group such as that.
Full disclosure: I've also joined the group "Hallo. My name is Inigo Montoya. You killed my father. Prepare to die" and "International Talk Like A Pirate Day." I've also become a fan of Aretha Franklin's Inaugural Hat.