He's only got himself to blame - he clicked 'Accept' on every single one of those 2000+ friends. If he didn't want that many, he shouldn't have added them.
You're not going to tell everyone that the VC you just met with is a tool - but I bet you anything there are a handful of people you do want to tell and discuss it with.
This issue needs to be solved from both angles. An experience that encourages the sharing of content with dynamic lists of connections + an interface that organizes content based on conversations and not strictly a news feed of interactions taking place within your personal network.
but I'm probably not the only one that didn't realize what I was doing by being "too friendly".