Great information. StumbleUpon is definitely a site for actually cultivating relationships with other people who are passionate about the same things you are
... some of those other social networking sites seem to promote never really knowing who your friends are. I like how personal Sumble Upon is.
And it's not as if having a cap on 200 friends is very limiting -having 200 friends that you've actually get to know (at least online

) is pretty cool
YC's article you link to is definitely informative. I especially like #10.
