Meltwater Group has acquired Boston-based social media monitoring company JitterJam for $6 million. In February 2010, Meltwater had spent $4 million to acquire BuzzGain. Meltwater’s social media monitoring business has been doing very well, but only accounts for a small part of the company’s sales. Meltwater’s sales in 2010 added up to $106 million and $77 million in 2009.