Last night saw YouTube’s live stream of a U2 concert in California, watchable by viewers in 16 countries. A Twitter widget was built in allowing people to chat about the gig, complete with a dedicated #U2webcast – it’s still one of the top trending topics on Twitter this morning. It’s still accessible via this link http://www.youtube.com/U2 . However, it wasn’t the only livestreaming show this weekend: researchers the Far North Living Lab webcast a performance from the Insomnia festival in Norway, using BitTorrent. It was tied in with the EU-funded P2P-Next project. “If the scalability is good for live streaming, this can increase the amount of viewers without massive bandwidth bills,” says researcher Njal Borch.