Facebook stock hits record high after $19bn deal February 20, 2014 INVESTORS warmed to Facebook’s $19bn (£11.4bn) takeover of mobile messaging app WhatsApp last night as shares touched a record high of $70.11 during trading, valuing the social network at nearly $180bn. Investors’ initial fears that the social network, led by chief executive Mark Zuckerberg, may have overpaid for a chat app that has little revenue [...]