If you're using Disqus for comments, I won't be commenting on your site. I have just spent 15 minutes with Chrome trying to post a comment to no avail. If I go to the Disqus site, it says I'm signed in, but if I go back to the CNNMoney Apple 2.0 page I was on, there is no way to post a comment. I'm "disqusted" and I give up; it should be easier than this. Beware of Friday the 13th!
I have third-party cookies blocked. If you need a third party cookie to do your work, you're not doing it right.
Ironically, I was signed in and fine until I received an email from Disqus that someone had posted a response to my message. That email message apparently signed me out of Disqus and I haven't been able to post a witty response since.
Update June 6, 2014: I am back to using Disqus again. I need to sign in before writing my comment as the act of signing in deletes everything I've typed so far. I still don't allow third-party cookies and I can usually get signed in to Disqus now.