Try with http://mattermark.com/ they have a great list already compiled

Dan asked experts in his network to donate 1 hour of their expertise to help others as his birthday gift. Thats how Clarity was born!

Clarity CEO Dan Martel explains this in his blog post "From a Birthday Wish to $1.6M in funding" http://www.danmartell.com/clarity-from-a-birthday-wish-to-1-6m-in-funding/

I don't know the exact figures but I'd bet that embedable profiles were a key strategy to drive traffic and revenue from experts' blogs to Clarity - just as embedable videos were key for YouTube's growth.