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Lead-IQ.com does that. It extracts the keyword, adgroup and campaign behind all the leads that came from Adwords. It also extracts if the lead came from re-marketing (and the website that sent the lead) as well as Google Display Network (telling you the exact website that send you good/bad leads). Actually it extracts all the source traffic behind all your leads.
If you use lead-IQ.com you can even find out the person's name behind the goal conversions from any source traffic and also facebook of course. Basically it goes deeper than Google Analytics goals which are just number of goals. The problem with GA is that you do not know if those goal conversions are any good, which is a big limitation in GA and Facebook conversion tracking.