In the mad scramble to keep up with all the major social networks, a number of third-party clients have popped up over the years to help you manage everything. Not that Twitter takes too kindly to these sorts of shenanigans. Still, services like Seesmic tried to replicate the native Twitter experience while augmenting it with Facebook integration in one app. When Twitter gutted third-party APIs for consumer-facing apps, Seesmic likely faced some trouble. What's a struggling independent developer to do? Team up with an even bigger one!
HootSuite is another popular social network management app, though it seems to have a more broad range of services, including integration with Google+ pages.