Yep! Social media is a great tool for digital marketing. And by advertising bitcoins you make more people invest in it, so in that way it has influence on bitcoin growth 
Obviously, Social media is playing a vital role regarding growing Bitcoin at present. I believe that Internet marketing is solely dependent on the social media platform so that Bitcoin promotion also gets benefitted by the social media. A lot of pages and site has played tremendous work for the promoting Bitcoin. That's why no one can deny the contribution of the social media for Bitcoin.