Lots of people know this already, but for the people that don't: the dates and times you see on posts are clickable links. They take you to a page just for that thing:
This isn't an obvious convention, but it's very widely supported.
(In the old days of the internet you didn't need this. All content was in only one place. With blogs and social networks, however, bits of text end up scattered around multiple views, so you need a way to get to the canonical source.)
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