I'm not very clear on the main driving factor of this acquisition: is it a talent grab, a technology acquisition or did they acquire Instagram mainly for the customer base.
The consensus seems to be that FB was more threatened by the prospect of google aquiring instagram than an independent instagram. Still though, that's a pretty penny to spend.
Well, it certainly wouldn't happen if your company employs anyone other than Turing, Einstein, Dijkstra, and Knuth. That said, that doesn't mean that the talent isn't inflating the price at least a little bit.
If your goal is to succeed in the real world, of course it is. If your goal is to get Google to beg you to pay inappropriately large amounts of money to acquire you, it's the best idea ever.
That's my thought too. Instagram has a plausible claim on all mobile photo sharing, and there's a strain of thought that suggests that 80% of the value of Facebook is photo sharing. Instagram might be a bit too much of a free radical for Facebook to let float around the market.
"We will try to learn from Instagram's experience to build similar features into our other products. At the same time, we will try to help Instagram continue to grow by using Facebook's strong engineering team and infrastructure."
I would say customer base is the strongest point, and that indirectly means technology. Instagram is huge. Now many people's default photo app will automatically upload to facebook, as a google+ instant upload competitor.
FB really wanted Instagram. They've been in talks since August 2011: http://thenextweb.com/insider/2011/08/24/facebook-couldnt-ac...