As an artist, photographer and someone trying to build a spiritual magazine I hve been on the lot of them.. or most.. Twitter, insta, snapchat, deviant art, Flickr, Pinterest, etsy, Facebook building probably hundreds of thousands of followers. I got work and business from them over the years but I actually had probably only broke even for jobs vs time spent not to mention I actually paid to advertise or buy followers etc. Since I found steemit I mostly forget to even post on them anymore and have to remind myself to keep my foot int he door on a few. Have managed to get a fair few friends to migrate here also.