Social Network Overload Syndrome

Social networks and related technologies have transformed the way we connect with each other - on both personal and professional fronts. I am a huge advocate of the use of social media, however recently I am suffering from social network overload syndrome! Daily I get requests and notifications from LinkedIn, Twitter, Yammer, Chatter, Facebook - and most recently Google+.

The question I am asking myself at the moment, is not "Do I need social networks?", its more like "How many social networks do I need?".

From the outset I have operated a "church and state" approach to social media - I use Facebook strictly for personal connections (ie friends & family), and I use LinkedIn for my professional connections. However I am now seeing a lot of crossover and duplication in the services I am using;

Connections - Facebook/LinkedIn

Broadcast/Content Curation - Twitter/Google+

Collaboration - Yammer/Chatter

I know there are technical solutions to aggregate the various feeds and notifications, however with the proliferation of new social technologies is becoming increasing more difficult to keep up. Ideally there needs to be some federation or consolidation in the space - however with so much commercially at stake I can't see the major players cooperating on this front anytime soon. 

I would be really interested to hear about how others are managing this problem (if it is one at all)? Is it just a matter of ignoring/culling some of the tools (do I really need a Google+ account?) or is it a matter of using tools or process to solve it? Any thoughts?