SteemIt Question: Is commenting disabled after a certain amount of time?

dwil30(50)
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#steemit
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I just joined the SteemIt community and have been exploring posts. Some of them are 6 months old but I'm just reading them now and I wanted to comment.

But doesn't look like I can?

Screenshot:
Screenshot 2017-03-21 12.38.31.png

SteemIt Question: Is commenting disabled after a certain amount of ... | Ecency