Facebook Inc. has appointed longtime product and engineering executive Tom Alison as the head of its core social networking app, making him the fourth person to hold that role in the last four years.
Alison, who’s been at Facebook for 11 years, will take over the job from Fidji Simo, who is leaving the social network to become CEO of Instacart Inc., according to a company announcement Thursday. Alison was Simo’s No. 2 executive, and previously had short stints running the app while she was on leave. He has worked on a variety of different parts of Facebook’s main social network over the years, including the news feed and search products. More recently, he was in charge of Facebook’s community products, including Groups, which are a top growth priority for Chief Executive Officer Mark Zuckerberg.