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One way they could do that is by software HTC Sense, changing the UI, they send all their Android phones. This user interface has a level of integration of Facebook in the way they prefer updates and allows users to post messages to their profile from a central point.
Maybe HTC ways to expand considerably Sense IU to manage more robust feature Facebook, and the new shortcut button is simply an external reflection of modifying the software. Anyway, it works very, very likely that HTC plans to more than balance the second hardware button on each phone with a source told the Financial Times that the Facebook feature remains "one of the main shoot of the HTC the year. "