I think you're misinformed: the real source of all internet culture is and was ebaumsworld.com.
Seriously, though, internet culture is more than just /b/. The Something Awful forums (where 4chan was born, after all), Fark and YTMND contributed a lot. More recently, sites like Reddit, Instagram, Vine and Twitter have become much more relevant than any 4chan board.
Seriously, though, internet culture is more than just /b/. The Something Awful forums (where 4chan was born, after all), Fark and YTMND contributed a lot. More recently, sites like Reddit, Instagram, Vine and Twitter have become much more relevant than any 4chan board.