Social networking tools aren't really new in the computing world. After all, AOL was the granddaddy of social networking environments back in the Internet's early days. But the extension of these environments to mobile devices is new. According to an Informa Telecoms report, about 50 million people, or about 2.3 percent of all mobile users, already use the mobile phone for social networking, from chat services to multimedia sharing. The company forecasts that the penetration rate will mushroom to at least 12.5 percent in five years...