Lots of news this week about European social networking, with headlines about Bebo, Piczo, Facebook, and Bahu. Piczo, reportedly the UK’s 4th-largest social-networking site, is going mobile, The Guardian reports. The site will allow users “to post photos, videos and messages from their phones to their profile pages.” [The Times of London reported that “British adults are more frequent users of social networking sites than any of their European counterparts,” with 40% of Britons using them compared with 17% of adults in France, 12% in Germany, and 22% in Italy.] France-based Bahu.com Bahu.com, a social site started by students for high school students across Europe, just received its first round of funding, it announced. “Bahu now counts over 300,000 members, and counted 2 million unique visitors in November.” San Francisco-based Bebo, meanwhile, just announced its plans to “join forces with Poland’s leading media company Agora to deliver a content-rich social-networking experience to the Polish online audience. It’s particularly appropriate to mention European developments this week because of the signing Thursday of the Treaty of Lisbon, the European Union’s reform treaty, at Lisbon’s Jerónimos Monastery (see this in the Associated Press and this commentary in The Guardian).