I imagine I’m like most folks. There is no way I have time for 3 or more social networks in my life. And while integration between services and the ability to “cross post” helps me keep more than one somewhat up-to-date the reality is the differences amongst the social services is so large this simple approach is fundamentally flawed.
Google+ has potential. One of the biggest needs is to quickly get a critical mass of users (hey, that means YOU need to join). If that happens and Twitter indeed starts cramming ads down my throat in the timelines I’m sure Twitter will be the one I drop (keeping FaceBook as well).