As you probably know already, GNU social is a GNU Affero licensed microblogging server software written in PHP that implements the OStatus protocol, an open standard for distributed status updates.
Everyone can deploy her own server and follow people in her own server or any other, as I explained here https://www.fsf.org/blogs/community/thousands-of-spaniards-leave-twitter-for-gnu-social.
I have run my own server for quite a long time, and the time to make some contribution back to this great software has come! I always thought that it would be great to take advantage of Unicode characters to insert some emojis in GNU social notices. You can always copy and paste these entities (http://unicode-table.com/en/) but the experience is better if that feature is integrated, so I decided to create a plugin.