This one has been bothering me a bit since rejoining the online community after a decade off. What is /b/?
4chan /b/. Used to be the final boss of the internet, now it's just a wretched hive of scum and villainy.
It does, however, generate a ridiculous amount of new Memes at a fairly rapid pace; coolface, FFFFF, RickRolling, LOLCats all originate from /b/.
Personally I don't peruse /b/. I do heavily peruse /tg/ and /po/, however.