i agree with MrC.
i use NewRoom often and FML, but beyond that, i don't tweet, or facebook, so my top apps will certainly be different the the next guy.
we all have our own preferences.
mainly i am into killing time while i am at a clients house, so my apps will differ from everyone else.
so IMHO there is no such thing as "top apps" as everyone will be different.
try stuff out, and if you like it, keep it, if not, get rid of it, then go from there.
Dalamar