If WhatsApp, the text-messaging service bought by Facebook this week, is worth $19 billion, what is BlackBerry’s messaging service worth? Heard on the Street’s Dan Gallagher warns it’s not such ... more 
If WhatsApp, the text-messaging service bought by Facebook this week, is worth $19 billion, what is BlackBerry’s messaging service worth? Heard on the Street’s Dan Gallagher warns it’s not such a simple calculation. Photo: BlackBerry. less 
1 / 19
WSJ Live
Fri, Feb 21, 2014 11:36 AM EST