Comparing Facebook to Zynga is like comparing an astronaut to a bed ridden granny. They may believe they have acquired something which is innovative and defensible - but the kind of morale and culture Zynga has will completely overpower anything they do. I will definitely be interested in seeing how many NaturalMotion employees stick around - I am assuming most of them got big payouts with 2 yr cliffs which is probably the only reason not to change.

Compare this to Facebook which has some of the best talent, culture and reputation of incrementally shipping out product.