What gogolita said, tho. Web site would be best, but its all about how much time and energy you have. With the quality of your work, picking one channel would be the least distracting from it and should still serve as adequate for wide distribution.
I think I speak for some of us in saying we would prefer you to choose plurk. We like you here. It can be really fucked up in other social medias, you should stay in the safe zone.
There are tools you can get that will allow you to advance schedule posts across several different platforms, listen for mentions, and monitor replies on a single page. Idk which is the good one now but just search for hootsuite or alternatives to it. Saved my sanity when I was a social media manager.
the more socials you operate, the more you have to spend interacting with people. People will ask you a question or try to get customer support on those platforms.
get a social media manager! i manage the socials for a store in sl and if someone asks questions or tries to get support on there, i just have a copy paste message to tell them where to go.