Most acquisitions should be compared from a lenses of a peer company acquisition (Peer multiples in financial-speak). If you compare the acquisition of Whatsapp with Viber a few days back, you would know why Whatsapp was such a steal.
I've always been a D3.js fan, more so because of the extensive range of novel chart types that it has. But, this looks good when you need a simpler solution.
Read more here: http://appiterate.com/whatsapp-vs-viber-who-got-a-better-dea...