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After reading this article i gave engag.io a try.  It's very simple to sign up different networks like Facebook, Disquis, Tweeter, G+, Tumblr, LinkedIN and FourSquare.  But there doesn't seem to be a way to add my bookmarking network, Diigo?  Still, Engagio looks like a very useful service.  No idea how they plan on making money :) excerpt: The killer app for the social Web is the one that will filter the signal from the noise. In the Facebook age, even casual Web users hold tons of conversations at once. Engagio, the conversation discovery company, pulls them all into one place. It also leads you into new ones. And with a new dashboard view released today, it lets you click one button to figure out what's actually going on in all these conversations. Engagio's dashboard breaks out articles, sites and other links from all your social networks into separate panels, and lets you reply, share and like straight from there. But the best part of this section is the "context" button.