How do you keep track of other Jellies’ info?

It was brought to my attention in a recent thread that I had a history with someone. I had no idea what they were referring to because it is very difficult for me to keep track on other jellies’ personal details as well as what they say in other threads.

Sometimes someone says something that catches my attention and I want to know more about them only to find that they don’t have any information on their profiles and it’s not always possible to know if they are m/f or their age, etc. I also feel funny lurking through a jelly’s page or responses just to check whatever I’m looking for.

When you really, really like/dislike someone is easy to remember things about them, but how to do it with others? I am fairly new here and only know a couple of jellies with whom I have exchanged personal info by PMs. I assume those who have been here a while would get a lot of info on other jellies over time. But I am curious as to how people keep track of other Jellies’ bits of info as if to complete a puzzle.

Do you send them PMs asking stuff directly? Do you keep notes on stuff of those that you like or want to befriend so that you can remember? How do you go about that?