Steve, have you tried Greplin and if so what's your experience? Does it negate the need for other search tools (I don't want a proliferation of search tools)? Does the indexing slow up your machine?
Gary,
it does a better search of your social networks than Google, probably because you're giving it permission to index them. You still need a general search engine (such as Google) for the broader internet content. Indexing has no impact on your machine. I haven't used it long enough to determine whether or not it's features are useful enough to make it my first choice search engine for social media/social network content.