http://paulgraham.com/startupmistakes.html
This is an example of A16Z killing a startup. They only care about about the big hits, so they'll happily dump too-many-millions into small products like ProductHunt and RapGenius, trying to force them to Get Big Fast.
ProductHunt should've been operated by two people for 5+ years but they raised too much money. Communities can't really be bought with money. You have to grow them organically and authentically over many years. Hacker News and reddit are perfect examples to emulate.
Digg is an example of the VC way of doing things.