So what’s Bebo co-founder Paul Birch doing these days, after having closed that little $850 million acquisition? Apparently, he’s getting into angel investing. Wubud, a mobile social network founded by serial entrepreneur and former AOL exec Paul Walsh, is his latest investment. Financials weren’t disclosed. Wubud’s blog says the app is still in its testing phase and will be open to the public in the “near future.” The site is still pretty bare bones for now, offering little more than a few blog posts on company news and the option to sign up for updates from Wubud.