A no holds bar anonymous thread for kigurumi on 4chan's /jp/. A lot of people lurk and don’t say that they browse this site because of negative association with vendettas and general salty behavior. Generally a slow moving thread compared to others so don’t expect a reply right away, you also may need a while until you find the thread. If you are very sensitive or easily offended, steer clear.
Facebook is one of the places where most western kigs share their photos. The above listed are only a handful of groups available on the site, as there are dozens of them, from local meetup groups, to making groups, etc. Almost every bigger local community will have a FB group to announce the latest meetups and conventions. Many makers will post about their latest progress on their own FB pages.
MisskeyA decentralized social network from Japan that has been growing in popularity since the Twitter apocalypse. It's a bit difficult to use at the beginning, but it doesn't take long until you get used to its interface. You can find kigurumi content on a regular basis under #着ぐるみ.
DiscordNowadays, Discord is the most active platform when it comes to exchanging in realtime about kig. There are many servers for various subjects so make sure to read their descriptions before posting.
How to Find/JoinThe Kig Map (message Renko for an add or changes)
Since kigurumi is a subculture, enthusiasts join together to hang out and meet others locally. In the past, kigs found each other through blogs and formed local communities. Most communities have moved into private Discord servers and you will have to look through social media in order to find your local community.