There are a few different ways to use social media to build links. When someone submits your content to the social media site, you can gain inbound links. But some sites limit spam submissions, so they use No follow tags on these links. The other way to use links via social media is by writing good content that creates a buzz and gets others to link to you organically. These sites can act as a platform for increased exposure, creating inbound links to your site.
For more you can check : Intro Video Cost. Social Media FAQs