Megan Casey said the following on SquidBlog:
You can break most online interactions into two groups:
Catchers and Throwers.
Catching is what you do when you collect friends of friends on Facebook, when you follow Twitterers, when you subscribe to RSS feeds of blogs you like. Catching can be a great way to organize your favorite bits of the web.
Throwing is harder. Lots harder. It’s what you do when you post on your blog, and keep doing it a few times every week. It’s starting a petition on Care2.com and getting people to sign it. It’s what you do when you make lenses about the things, ideas and people that excite you.
One should find the perfect balance between throwing and catching. The trick is to do it judiciously and respectfully. When you like someone’s blog and subscribe to it, drop the person a note and say thanks. When you disagree with a post, don’t bash the blogger, just… disagree.
Throw a lot. Just respect your catchers.