I was a bit surprised when Surya Yalamanchili, the former reality-TV star fired by Donald Trump from The Apprentice, told me he'd landed at LinkedIn. One would think his broadcast-TV star turn would afford him more than enough introductions in the Valley. Perhaps he likes a challenge. Yalamanchili, who previously worked for Procter & Gamble and started this week as LinkedIn's director of marketing, has traded packaged goods for social networks. His first task: Figuring out how to brand LinkedIn as new and improved. Despite the differences between the two sites, people won't stop talking about how Facebook will soon move in on LinkedIn's turf.