It's interesting that alot of people are concerned with FB vs Google. My initial thought when hearing about this deal was that FB could be more worried about Twitter. In my personal experience, many people will share instagram photos on twitter rather than Facebook as it comes across as less "spammy" to share photos frequently. Certainly, IMO, the subscribe feature that FB introduced last year was a reaction to the celebrity cult on Twitter. Granted, Mark claims that the acquisition of instagram will not affect the ability to share to other social networks, but I'm sure they will try to make FB the preferred platform to post photos as a daily update. It will be interesting to see if Twitter suffers a drop in photo sharing as a result.