I haven't technically told anyone really. I told one of my good friends and he told his younger brother (who i'm also friends with), they have both asked me "wtf?" when they first saw my Steam picture and I told them. They only brought it up that 1 time and haven't said anything about it otherwise. I live with my grandparents so even if i told them i would get 1 of 2 responses...
1. "What are you talking about? what type of show are you trying to explain?"
or
2. If they did have an idea of what I was telling them about they might think of the older generations, not Friendship is Magic.
I know my grandparents have probably seen the little things like my random pictures or a game mod or the wallpaper on my tablet, but haven't said a word about it. That's all i've told and honestly, i'd rather keep it that way, at least for right now.