The site is set that way to avoid people spamming on a meme. It can be frustrating but it's not really an error. The time between comments is 3 minutes, honestly I don't truly understand why, I've just been told it's to stop robot type spam from posting a ton of comments at once. And I've been in group commenting sessions where we were all commenting so much the server got overloaded and kicked a bunch of us off the site for a few minutes. I think the comment timer also gives the server time to keep up with all the posts, again I'm not positive it's just what I think.