I've read that article before, and I thought it was really true. One of the things I find odd about fandom friendships is the idea that you must agree on everything, because in real life situations. Naturally you'll gravitate towards people with similar interests, but it's silly not to be friends with someone just because they think H/Hr is soooo canon or they thought Firefly was rubbish.

My fandom interests ebb and flow, but in general I'm most active in fandoms with new canon. But it doesn't make me think any less of people who are still very active in an older fandom or who have gotten in to something new that I haven't.