I meant: it does matter which services or accounts you have to link as long you are required to link services and accounts it´s not a good thing, IMHO. Just imagine some gains access to one of these, you´re entire digital life can be screwed up in one strike.
Hmm, tried Disqus in the past; seemed quite unreliable, overly complicated, and clunky from a user perspective. Mind you, a lot of sites (and the majority of iPhone games sites) now seem to be using it as a comment system, so p'raps it's improved.