With over 500 million users, 50% of them regularly accessing the site via mobile, Facebook cannot be ignored. Facebook Places is similar to Foursquare but even more social, as users can share and earn rewards together. Anyone can set up a Facebook Places page for your business, but you will have to claim your Facebook Place, connecting it with your business Facebook Page to take control over it and promote it yourself.
If you’ve got a fitness app, you might have segmented your potential audience into 2 groups. Men who want to get huge lifting weights, and men who want to get ready for a marathon. As you can imagine, they have completely different goals, and their interests and behaviour will reflect that. You need to take this into consideration when you create your images.