New compatibility table at funfedi.dev: JSON-LD @context
https://funfedi.dev/support_tables/generated/context/
6 out of 9 implementations accept any @context
value. But Mastodon, Hollo and Friendica reject activity entirely if https://www.w3.org/ns/activitystreams
is not included in @context
. Mastodon probably does this for no reason, but what about #Friendica and #Hollo?
#ActivityPub specification, section 3. Objects:
Implementers SHOULD include the ActivityPub context in their object definitions. Implementers MAY include additional context as appropriate.
ActivityPub context is recommended, but not required.