Starting your advertising on social media makes it easier to track consumers who use it to start the buyer’s journey. You can then retarget the right people on social media by adding the Facebook Pixel or the Twitter Tag to the code in your website so it recognizes returning users.
There is one main downside to tracking customers through social media (or any other deterministic method). There’s no way to identify a returning customer with a pixel or tag if they aren’t logged into their account. Social media is a closed platform, or “walled garden.”
Despite this downside, the benefits of being able to advertise to and retarget your customers on social media outweigh the negatives, and social media sites are working toward expanding their retargeting capabilities outside of the closed platform.
Read more at http://www.business2community.com/social-media/need-social-media-advertising-mobile-first-world-01469160#0ObHpbXC1wmEyree.99