Tango, a messaging app and mobile social network, has raised $280 million … Eric Setton, CTO and co-founder of Tango, says 70 million of its 200 million registered users are active every month.
Tango Raises $280 Million via Business Insider
I used Tango for a short while on my Windows Phone before Skype was released on the platform. Not a surprising valuation for Tango given the recent WhatsApp purchase and their MAU’s. Their monetization and virality model seems focused on not dissuading users in any way (i.e. no core functionality behind paywalls).