Google (GOOG) has acquired Wildfire, a provider of solutions that help advertisers manage social media activity. The price tag is reportedly around $250M. Oracle and Salesforce.com have also bought startups in this space, evidence tech companies are bullish on Facebook (FB) ad spending even if Wall Street still has doubts. Google's purchase allows its growing display ad unit to cross-sell social media ads. Constant Contact (CTCT -5.3%), another player in this market, fell sharply.