Shameless plug, but my startup Xendo (http://xen.do) connects into Google Drive, Evernote, Dropbox etc. and provides a single search across all of them. You can 'pin' content so team-mates will see specific items promoted to the top of their results if they're relevant to their search. Let me know if you're interested in following up.
We're going to be introducing a 'professional' level soon at a fairly low monthly subscription. We'll be announcing shortly.
Your stuff looks interesting, we should have a chat offline.
Comedy implementation of the observation that there's a sizeable section of society that prefers the 2D - Facebook/Twitter method of interaction vs. real, 3D, interation.
I guess it depends what you mean by 'quality'. A methodology for determining 'quality' would be awesome, some function of timeliness, authority, context, accuracy. I don't see that quality is correlated with volume though.