All that chatter from people decrying an increase in ads when they visit Facebook may not be exaggerations from an agitated few. Facebook CFO David Ebersman said during the company’s first-quarter earnings call on Wednesday that the social network served up 39 percent more ad impressions in the most recent period than Q1 2012. That impression increase likely has as much to do with Facebook’s daily active user base growing by 26 percent year-over-year to 665 million people as it does any efforts to further boost its advertising revenue—up 43 percent year-over-year to $1.25...