(edit: not that Twitter themselves have done much to offend me - "Twitter the company" above is more of a stand-in for commercial social networking companies at large)
2nd edit because I've not had my coffee yet and didn't explain myself properly: the "whole concept" that I'm talking about is, I guess, what people used to call 'microblogging' - a service of which Twitter is the holotype; as far as I can see, the real utility of it is in its constant presence via a phone app, but I am not sure if I want to do that. I definitely don't want to have that in my life by joining Twitter, but I can't make up my mind whether my dislike is more about the companies providing the service, or more about the generic service itself.
Does that make better sense? :)