Andy Carvin, the former NPR journalist who used Twitter to blog about the Arab Spring and other news, is joining the start-up news project bankrolled by billionaire eBay founder Pierre Omidyar.

Carvin, 42, will work on social-media strategy and community engagement for First Look Media, the venture announced by Omidyar and former Guardian journalist Glenn Greenwald last fall. First Look, which has hired a handful of top journalists, will cover a broad range of topics when it launches later this year, backed by a $250 million commitment from Omidyar.

Carvin gained notice for an innovative form of journalism as unrest swept the Middle East in late 2010 and 2011. His tweets — sometimes more than 1,000 a day — linked to news, photos and video of news emerging from the region. He took a buyout from NPR in December.