MarketWatch: It may have been hard to notice over Donald Trump’s hair, but Facebook’s brand was plastered all over Thursday night’s GOP debate, giving the social network a one-up over competitors that are also trying to dominate the live events space. Facebook, which has been trying to align its brand around public figures and major events, didn’t live stream the event, which may have upset some cable-cord cutters. But its official role as debate co-host, along with Fox News Channel, gave it a marketing, and video, edge. The company reported that 7.5 million people had more than 20 million Facebook interactions, which includes posts, comments likes and shares, about the debate.