One feature that is sorely lacking is a "favorite". It would be great to be able to bookmark within Plime favorite posts, threads, comments, etc.
One way would be to post something to the news section of plimates (or perhaps a sub-section under plimates entitled "favorites")
Very few posts are made to the Plimates news area so it will be easy to go to the actual post you created. Your post could have comments linking to each of your favorites. You could also include the link to your post listing your favorites in your bio.
A subsection entitled "favorites" might be called for as Plimates is limited to level 10 for posting of news.
In the same vein, if you wanted to add a comment to an old link we could have a subsection under "plimates" entitled "conversation" or "debate" or something similar where you can post a link to the original post you are adding comments to. This would allow you to communicate about something that may be off the sites radar.
I am sure many of us have wanted to add a comment to an article but it was old and off the front page that no one would see it.
Plime is an editable wiki community where users can add and edit weird and interesting links. Users earn karma when other users vote on their actions. The more karma you have, the more power you have at Plime.