Twitter might be the newest new thing for millions of internet users but, for most of Silicon Valley’s geekerati, it is Friendfeed (www.friend feed.com) that remains the hottest social networking application. If Twitter is emerging as the Microsoft of the emerging real-time web, then Friendfeed – which unveiled a major upgrade to its interface last week – is akin to Apple in its ability to muster a noisy following of hardcore evangelists.