Yes we need social media for the promotion to clear the questions of the other who have don't know about bitcoin because many people are talking about this currency but they don't know how to use it because they don't have enough knowledge to invest in bitcoin, social media is the best promotion to have some knowldge about bitcoin.
In addition, most people definitely have social media. Active in social media becomes a form of existence of modern society. So the dissemination of information through social media becomes very effective.I think social media promotion is not needed anymore because Bitcoin is widely known and a lot of people are curious in this kind of monetary system technology in a digital form. Too much advertisement will only cause Hype and more volatility on its price, We all know that there are a lot of greedy people out there that wants to multiply their money in a very easy way and Bitcoin is not made to multiply the investments and that's not the main purpose of this technology.