Salesforce.com buys InStranet to make call centers suck lessSalesforce.com spent $31.5 million on August 4 to acquire San Francisco-based call center software company InStranet. It's Salesforce.com's largest acquisition ever. Careful with the champagne, though.InStranet went through its third round of funding way back in 2001, when it raised $14.7 million at a $50 million valuation in a round joined by Benchmark Capital. So it's not a huge exit. Then again, at least it's an exit. Salesforce.com will also report its second quarter earnings today. Analysts expect $260.56 million in revenues for a 47.6 percent year over year growth.