This series from Bokardo is excellent:
Common Pitfalls of Building Social Web Applications and How to Avoid Them
I especially like #10 from Part III: Failure to see the larger war…
“Techcrunch is not word-of-mouth. Getting Techcrunched or Slashdotted or getting Dugg…is like being involved in a drive-by shooting. I’ve also heard it described as getting seagulled…they swoop in for the attack and are gone in a second.”
Rather than chasing that sort of fleeting glory, he recommends instead building an audience that really cares one user at a time.
You should read the whole thing. It’s full of advice that is much better than anything you’ll find here.

Nice link.
Interesting link. The point you raise is very topical given the Techcrunch-50 currently taking place. I liked #7 highlighting an over-focus on social value.
Cheers
Sam