You want to get followed & shared. The premium plugin increases the chances that this happens.
For example, you can also choose a “Follow”-feature for your Facebook and Google+ icons, so that people can follow you on Facebook & Google+ directly from your page, i.e. without leaving it.
Also the sharing texts got improved. For example you can now automatically include your posts titles in the tweets which people send out. That makes your tweets more attractive, generating more traffic.