It took me a while to learn what EGOL just mentioned. If I have any quality content it goes one place, on my site.
But I do see social having its place and I also see a time limit for social as well, because before you know it large amounts of your time will be eaten up by it - and unless you know what your doing large amounts of it will be dead time.
So to me filling up a social profile with hash tags, unique content, links, images etc doesn't hold much weight. I just use social to list build numbers of followers, when I release a new piece of content on my site I share it with my lists - depending on the type of people in your list you may get re-shares, links, onsite shares, comments, email signups etc.
Thats just my thoughts though, I dont use social massively.