Like a well oiled machine by the end of it. You’d submit some information; likes, interests, hobbies, etc. and then you’d be paired with another participant based on a random draw with some selection restrictions (i.e. national vs international). You had roughly a month from being matched with someone to get a gift shipped out.

It was particularly fun to get to know the person both through their suggested interests but also to take a peek at the communities they participated in. You could post gifts you received to a gallery (which I wish they archived), confirming receipt and letting the sender know your appreciation.

Some people sucked, and wouldn’t deliver on their end, so there was a volunteer “elf” system that would let folks become secret santas for any recipient that was let down by their own santas. Not sending something generally got you banned from future participation, and filling the elf role would gain you general reputation within the program

The only thing I’ve missed, like truly missed about old Reddit was Secret Santa. There was something so fun about it, and the system was so good. I know it’s logistically challenging, even more so for a federated platform, but it was one of the things that made the site feel unique.