Two things come to my mind.<p>If you live under a regime that looks for dissenters in social networks, encryption will protect the message but not yourself: you&#x27;ll stand out and they can come and ask you about the content of your messages. I won&#x27;t feel much safer. They probably already know your contacts anyway.<p>What if you encrypt locally outside the browser and paste the ciphertext into FB? Are they going to block your account? Incidentally that would increase your security because you&#x27;ll be forced to use more secure communication channels.