One of the hidden features with previous versions of PeepSo was linking to a single activity stream item or a comment.
Basically you would click on a timestamp and the page with single activity stream item will open.

Starting from PeepSo 2.5.3 those options are put in the spotlight and are now much easier to find.
Just hover over the chain icon next to a timestamp and you will be able to click and copy the direct link in both individual posts and comments.