• What have you enjoyed?

I'd like to say I enjoyed all the extra participation in the site that resulted from the hats, but to be honest I didn't notice any big increase in new users, just the regulars going hat-hunting.

• What would you like to see for next year?

More bespoke hats for each site. Perhaps one particular one for each site that can be worn across all SE sites, as a bit of promotion for the other sites.

Also, perhaps a global leaderboard, not just site specific ones. I like to see who's getting closest to getting the full set.

• Did you find all the secret hats?

I don't know. Did we?

• What have you enjoyed?

I'd like to say I enjoyed all the extra participation in the site that resulted from the hats, but to be honest I didn't notice any big increase in new users, just the regulars going hat-hunting.

• What would you like to see for next year?

More bespoke hats for each site. Perhaps one particular one for each site that can be worn across all SE sites, as a bit of promotion for the other sites.

Also, perhaps a global leaderboard, not just site specific ones. I like to see who's getting closest to getting the full set.

• Did you find all the secret hats?

I don't know. Did we?