They had 400 million monthly active users in December 2013. At the same time they had 50 employees I think as well as modest server expenses. They had signalle

They had 400 million monthly active users in December 2013. At the same time they had 50 employees I think as well as modest server expenses. They had signalled quite early that they where going to charge money, they had started charging money from at least a subset of users and they were still growing like crazy, 200 million monthly active users since april that year it seems based on the statistics I found. To me that sounds profitable.