He’s got a point:

What’s the point of single-purpose social networks if you have to publish content from one onto another? For Instagram, they may have built an app-only social network, but not everyone (like my family) uses it enough for it to be useful on its own. Foursquare and Gowalla suffer the same problem. So often in my Twitter timeline I see people saying where they are with a link to either site.

I love Instagram, but if I couldn’t post my ‘grams to Twitter on occasion then I don’t know if I’d be using it nearly as often.

Louie Mantia on Social Networks