That's a lot of social media. Do you need to belong to them all? Personally, I don't think so.
When you thin yourself out, then nothing is good quality.
I say focus on making your website or your blog great. If your thing is photos like my pal Scott, fill up the Flickr.
Find your niche, then use one or two social media sites to your advantage to market it.
Remember the adage, less is more.