An alternate universe where teenage girls reblog pictures of attractive girls or cute couples and use the terms "forever alone" or "UNF" a lot. They then get so obsessed with how many followers that they have, and this leads to them sitting on their computer for hours on end and never hanging out with their friends.
Oh and watch out, Tumblr goes from puppies to porn in a matter of seconds. (or if you prefer kitties to titties, it's the same idea)
John: Hey Matt, where's Jenny? I haven't seen her in months!