Who would of thought.
But seriously, page rank has little to do with most popular.
A big YES!!!!!
It's holding the topmost potions in the list of best social networking websites :)
In my opinion still now yes it is; but G+ may defeat it soon.
No, its Y combinator..lol
Of course, it's the MIGHTY Facebook..
Facebook is the No 1.
Facebook is the most popular and utilized. It is unbeatable at this point of time.