On the other hand, Asian companies are producing some of the fastest-growing apps in history. Tencent's WeChat boasts 400 million users - far more than Twitter, by way of comparison - while LINE and KakaoTalk claim 120 million and 80 million users, respectively. Both have laid the groundwork to expand into the U.S. market.

Facebook has stepped-up the focus on mobile has made it the most-used Smartphone app as well. Its new offering Facebook messenger too is garnering lot of attention. However, 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.

Many of those who are using the new messaging apps still remain on Facebook, indicating there is little immediate sign of losing its lock on the market. Facebook at a press conference this week, will unveil news relating to Android, the most popular mobile platform in the world, which could include a new version of Android with deeper integration of Facebook messaging tools or possibly even a Facebook-branded phone.

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