Here are a few things to consider as you consider how to best leverage social ads:
-What are your marketing goals?
-What's your budget?
-What does your audience need?
-Which channel will work the best and what type of ad should you use?
-Experiment and create multiple ads and test them out to find out what will work the best.
Source:
http://www.socialmediaexaminer.com/social-media-trends-2014/