how many facebook users?

there are just under 1 billion facebook users.

how many internet users?

there are more than 2 billion internet users world wide.
internetworldstats.com

if we, for whatever reason, want everyone to be rich, then (given certain other premises) must invent ways for people to both be rich and perform a range of kinds of work, from manual labor to, say, finance.

how many college students are there in the united states

first source listed (on lycos)
i.e. resource jackpot
http://www.quora.com/How-many-college-students-are-there-in-the-United-States

realm of on line learning

http://edinnovation.asu.edu/
@above, a list of 70 or 80 sponsors, all co.s in the industry ... wow

let's say ...

let's say i want to follow 100 blogs ...

the answer

actually, this is the answer to everything: little groups of linked images ...

why? because they're so cool