First of all thanks for listing my article in your post :) A big thing. Rest I have a feeling that it bought Insta obviously because it was terribly weak in mobile and Instagram was going solid. so better kill it and get the talent to work for ur stuff. they did the same stuff with snaptu.
Now coming to search yes it is very much possible it is sitting on the 900M or lets say 500-600M users personal data. Google is envying that and FB +Microsoft can be a good deal.
I think Fb wants to own the mobile internet world. what say?