Napster’s Sean Parker and Shawn Fanning have reunited. The tech titans have teamed up to launch Airtime, a new live social video platform. Parker, who has also been involved with Spotify and was famously portrayed by Justin Timberlake in “The Social Network,” will give a live presentation with Fanning, who most recently started Path.com, at Milk Studios on Tuesday morning. They’ll be joined by a seemingly random group of celebs, including rapper Snoop Dogg, actress Kristen Bell, Ed Helms, Julia Louis-Dreyfus, Joel McHale, Olivia Munn, and domestic diva Martha Stewart to get a sneak peek at the site.