What is the best 2 0 communikittenion strategy to promote the launch of a new mobile application

What is the best 2 0 communication strategy to promote the launch of a new mobile application

The app MyPiece in Montreal use giveaways on Facebook.Right now, in a post they offer one year of Boustan by choosing one person among people who : like their posts in Facebook or share.But 1.0 communication works great too.