Mashable: Facebook has marked a landmark moment in the company’s development: The social networking giant cracked the hardest nut of getting you to look at ads on your smartphone. Advertising on mobile devices now accounts for 76% of the company’s total advertising revenue, or $2.9 billion. Facebook, in other words, has learned better than any other social network how to turn your profile into space it can sell to advertisers. When Facebook went public in May 2012 it generated almost no revenue from smartphones.