Entice drivers to link to their social media accounts by offering features like automatically tweeting a photo of anyone you honk your horn at, and updating an online leader board of top speeds driven along every section of road.
Yeah, when I worked for TomTom and suggested that idea, they weren't very enthusiastic about it.
And my other suggestion about a TomTomagotchi that you have to regularly drive around to different places to keep happy didn't go over very well, either. Maybe a petroleum company would be more receptive to that idea, though.