Probably need more context to give a better answer. Seems like you are asking from a user's point of view. I'll almost always use disqus if it's available to l

Probably need more context to give a better answer. Seems like you are asking from a user's point of view. I'll almost always use disqus if it's available to leave a comment, generally because it's simpler. Not having disqus doesn't change my willingness to contribute, providing I can do so simply..like entering my name and email. If I have to register/confirm/activate forget about it unless it's a site I'm particularly invested in (say, HN). From the development point of view, unless you have specific needs which disqus doesn't meet, I don't see why anyone wouldn't use them. They've turned the "writing a blog in language XYZ" tutorials into 5 minute exercises. On the top end, they are used by an ever growing and impressive list of people. Finally, since you can export all comments at any times, I really don't see what you lose.