Spacebook. (It's a terrible joke I know).
If you know that one, try this one: Why do seagulls fly to the dump
Nobody knows yet.
Karma. (Please forgive me)
Omega!! Note: surely it already exists but I thought of it independently and am proud of my terrible joke!
My Dad:We used to keep useless information to ourselves.
Sorry, still calling you Bruce! I found this on Facebook somewhere; I dunno who to get credit to.