Design and development of an application on HTC Bulgaria’s Facebook page. HTC Here’s To Christmas Facebook app promoted the new HTC One. Users had to like HTC Bulgaria page and choose one of the new HTC One models in order to participate in the game. We have also activated automated postings on users’ Facebook walls. The app was supported with Facebook ads which increased the users engagement with 350% for the first week of the campaign. The fan base of HTC Bulgaria Facebook page increased with more than 15 000 new users by the viral effect of inviting friends.