You need one, but the word 'need' is too strong. If that's the case what other word would you use?
With that said, lately i've been in the process for searching for one because of the reasons i stated above. I'm looking for a like-minded community on Art stuffs. A forum will do, but microblogging seems to be more inlined with my desired, as i described above.
I guess to reword my previous post; "social networks" can have different applications in my view. In the case of microblogging, i like the idea more as a Forum flipped on it's head to reduce friction on content posting.