@Hawkee: New social media commenting standard suggests that clicking a comment's post time, eg "3 minutes ago", takes you to the post's permalink. In case you're interested in doing that. :)
You have no behavior when clicking the Time Ago text. It does seem to expand the thread when you click the 'responded to a' text, or to the right of the time in the same dev/span region.
The Time Ago as permalink can be seen on Facebook and some other blogs. I can't say what else off hand.
Wow, I never knew you could do that on Facebook. I guess you learn something new every day. I doubt most folks know about it though. I'll keep it in mind next time I edit that part of the codebase.
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I was following the Twitter convention of expanding the thread when you click. Where have you seen it the way you describe?