General

Not really. You can use the chat room to DM whoever you are feeding to discuss things. I know I've had people stuff themselves for me in chat many times. But that's not the same as a dedicated system/service for stuffing.

If chatting is enough for you, I recommend staying on platform.

I don't know who told you that, or gave you that idea.

But no, there's nothing officially sanctioned or formally organized by FF.

Any such interactions between two users is the business of those two users and no one else. If you like, you can try posting a thread in the personals if you might like to find someone for this.

However, if you do so, keep in mind rules #7 and #8, which basically means no asking for money or free stuff, and there's no obligation on the part of any other member to give you anything.