[drobati]

I've had an instagram since it started and have watched friends slowly adopt. It really seemed to be catching fire in the past 3 months.

So in my experience I've found that people follow me but because the tool doesn't very easily show if someone follows you back, without digging back and forth through your followers, it's very easy to just unfollow the friends who don't provide content I care about.

It's more similar to Twitters model of pub/sub vs facebooks 1 to 1 dynamic. If I 'defriend' on facebook it forces you to defriend both ways right? I think facebook has made attempts at fixing this with subscriptions but ...

[chrischen]

On facebook if you unfriend someone the other person is still attached to you as a subscriber... but they'd only get your public content.