Youth flock to mobile messaging apps, may be threat to Facebook | Reuters: "Create personal profiles. Build networks of friends. Share photos, videos and music. That might sound precisely like Facebook, but hundreds of millions of tech-savvy young people have instead turned to a wave of smartphone-based messaging apps that are now sweeping across North America, Asia and Europe. The hot apps include Kik and Whatsapp, both products of North American startups, as well as Kakao Inc's KakaoTalk, NHN Corp's LINE and Tencent Holdings Ltd's WeChat, which have blossomed in Asian markets. Combining elements of text messaging and social networking, the apps provide a quick-fire way for smartphone users to trade everything from brief texts to flirtatious pictures to YouTube clips — bypassing both the SMS plans offered by wireless carriers and established social networks originally designed as websites. Facebook Inc, with 1 billion users, remains by far the world's most popular website, and its stepped-up focus on mobile has made it the most-used smartphone app as well. Still, across Silicon Valley, investors and industry insiders say there is a possibility that the messaging apps could threaten Facebook's dominance over the next few years. The larger ones are even starting to emerge as full-blown "platforms" that can support third-party applications such as games. . . .