I agree, this is quite worrying, and I'm not aware of "data licensing" for services like Facebook. From the FAQ: --Greplin updates your data approximately eve

I agree, this is quite worrying, and I'm not aware of "data licensing" for services like Facebook. From the FAQ: --Greplin updates your data approximately every 20 minutes, however, in high-load situations, updates can take up to a day. So it definitely seems like all your data ends up in a giant DB somewhere. Unless they've worked out amazing data licensing contracts with Facebook, Google, LinkedIn and Twitter, I'd be very surprised if this was legal. EDIT: Facebook appears to have changed their data retention policies from what they were. The 24-hour caching restriction seems to have been removed: http://developers.facebook.com/policy/#policies http://developers.facebook.com/policy/#policies