The mystery of old posts and new comments

Has any of you noticed how sometimes very old posts, sometimes months old, sometimes years old, are somehow magnets of new comments. Every now and then I get a notification in Diaspora about a comment being made on a post I participated in, and to my surprise it is a very old post, where most comments were written a long time ago. For some reason, new users keep appearing and sporadically commenting on them.

Why is this? Has Diaspora fractured the space-time continuum? Is it a glitch in the Matrix? Are we on a simulation?

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