There’s so much info here that I think it would be beneficial to have a way to click next to a post to save it into a post scrapbook or something similar that’s unique to each user.
In this way people can save particularly useful information and gain access to it in a fairly quick method.
Implementation wise, put a small button somewhere by each post that just adds that post id to an array in the database for each user. Then have a page somewhere, maybe under Quick Links, that can show all those posts similar to how “My Activity” displays posts when viewing a user’s profile.
In terms of how much more use the database will get… probably not a lot, since I’d imagine most users won’t use this and if they do, it’s only a kB or so per user that does.