I think FB got a great deal here.

They got ~10 top grade Google vets. Assuming they each have to stick around for 3 years,

$15MM/(10*3) = $500K/year each.

And the $35MM in stock = 0.54% of Facebook. Divide that by 10, and you get 0.05% per head, which doesn't seem extravagant at all.

It's the FF employees who are bearing most of the risk in this transaction, in the off chance FB isn't actually worth $6.5B.

It depends on how you leverage 10 top notch engineers. I'm guessing they wouldn't have done the transaction if they figure they couldn't get at least $50M in value from these guys which at Facebook's scale isn't that hard.

12 programmers, 1 million + users.

Now unlike Twitter, friendfeed is not made of a bunch of marketers following other marketers. If you follow someone on Tiwtter you get something like "Thanks for the follow. I am expecting to learn from you. Check my website...".

Also The discussion around a particular shared item on FF is easier to follow.