If they're still online, that's where you'll find them.
My guess is that it isn't possible, but I thought I would ask...
I had old discussions tracked. They had good information that I wanted to be able to reference. A few were started by me.
I logged in today and they are not in my "tracked discussions" section. Is there any way to get them back?
How long do they stay uploaded? How can I prevent this is in the future?
I would ask this question to those that run this site, but it doesn't seem possible. Also, I don't see the answers to this question in the FAQ's.
Thanks for any help you can give me.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic