Facebook is the main source of Social Media, I post gadgets-related or software-related stuffs. Sometimes, I post updates on my game also.
Twitter is the second source of Social Media, I post the same stuff with Facebook but with the exception of posting also other things.
Space Sim Central
Space Sim Central is where I post update on System FRONT. There are great guys there, they gave me a sub-forum exclusively for me.
I am not active in this site but I would try to update it.