OK, bummer results here.
I'm a qualified yes. This tradition is one that's been important to me since my earliest days on the Internet.
I've always liked the gentle, goofy humour that comes from April Fool's Day jokes. And I'm impressed when people make cool hacks for their pranks.
It feels a day where we act like we are all on the same side, and all in on the joke. That this big network isn't something to take too seriously. That there's a straight line connection to that earlier time.
We had a few April Fool's jokes on Identi.ca. One year, we launched a few fake social sites like Freelicious and Foursqualour, parodies of existing sites at the time.
Another year, everybody on the network took on new accounts spoofing Twitter celebrities of the time. It is one of my fondest memories of the network.
On Wikitravel, we created a travel guide to the fictional island of San Serriffe one year. It was a lot of fun.
https://wikitravel.org/en/San_Serriffe