Fox executives told advertisers today during its upfront presentation that it will embrace digital platforms by offering opportunities to buy spots that will run on a TV show anywhere it airs — including digital sites such as Hulu. Fox Broadcasting President of Sales Toby Byrne promised to deliver “a unified audience experience.” He added that “the Internet and mobile are television’s friends, not enemies.” The company says it has 150 million followers on Facebook and Twitter, which is 29 million more than the next-highest network. Execs crowed that Fox has been No. 1 for seven consecutive seasons — although they didn’t say that they owe their success largely to the popularity of American Idol. Fox also says that it has four of the five most-followed shows: Family Guy, The Simpsons, House and Glee.