Almost every social media site wasn't marketed. MySpace didn't have marketing, neither did Facebook, neither did Twitter, Snapchat is still popular even though it struggles to make any money. Those are just the few that come to mind.
I don't have an exact percentage, and percentage wise its probably low when factoring in all the websites in existence.
I don't have an exact percentage, and percentage wise its probably low when factoring in all the websites in existence.