[qntm]

All of my blog posts have buttons for Digg, Reddit, Delicious, Facebook and StumbleUpon, none of which I use. There are a thousand other buttons I could add too. Hell, I have Adsense banners which I almost never see on account of Adblock.

It's not hypocrisy, it's compatibility. Every social networking site offers a bunch of new interactions, and you can support members without endorsing membership.