diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -6,6 +6,11 @@
 
 > Autres : Federated learning (google...), IoT (?), GitHub, Discord, édition collaborative type Framapad/Collabora/OnlyOffice
 
+### Mastodon 
+
+Tags : micro-blogging, federated, ActivityPub
+
+[Site officiel](https://joinmastodon.org/)
 
 ### Element 
 
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