Social networking and photo-sharing websites retain photographs deleted by users, reveals research by Cambridge University. Researchers uploaded photos on 16 popular websites – including Facebook, Yahoo’s Flickr and Google’s Picasa – noting the web addresses where the images were stored and then deleted them. The team said  30 days later, it was able to find them on seven sites,... 

Yahoo is looking to buy companies that will allow it to become a bigger player in social networking and revamp its family of products, Chief Technology Officer Ari Balogh said on Wednesday. Yahoo has had conversations with companies about partnerships and “more interesting” possibilities, said Balogh, who is executive vice president of products at Yahoo. “I can guarantee you there...