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Probably Signal would have been a safe bet. Telegram doesn't do encryption by default (on group messages? Been a year or two since I've used it). And Facebook complies with law enforcement agencies, and I don't think it's unreasonable for them to have a feature flags to selectively and transparently disable encryption for some participants if need be.

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Telegram doesn't do encryption on group messages at all, nor does it do encryption by default on any messages.

End to end encryption is available for one-to-one conversations, but must be turned on manually.

Facebook certainly likes to at least have sense to know what you are conversating about. Sometime in 2016 we and my buddy abroad got our accounts frozen "due to security reasons" at exact same time; what we were doing is having fun with FB Messenger and sending each other PGP-encrypted messages. This least about 2 months and my buddy is Egyptian, so I am pretty sure at some point FB said "we don't know what they chat about and enough is enough". I got my account recovered after multiple layers of verification including video-call to hold up my ID done by third-party ... my friend never gotten his reinstated.

Facebook definitely has some kind of chat monitoring and real-time censorship in place. For example, I once couldn't send a message in private chat if it included a link to one of the online weed stores. Remove the link, and it goes through just fine. Put the link there, and the thing just hangs and errors out with no coherent explanation.

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