I’m looking at you retweeters (especially those of you who admit you don’t actually read the links you retweet… And the individuals where it’s implicitly obvious):

“Another implication here is that people who share content in laborious ways are more engaged than power users. If you copy a URL, paste it into TinyURL to shorten it, copy the shortened URL, go to the twitter.com website, paste it into the box, add a comment — that’s a lot of work going into sharing, compared to someone who has all that kind of thing automated in a toolbar button. And the greater the amount of effort involved, the stronger the relationship between site and sharer, as a rule.”