Facebook (et al) already hand over user data to UK and other authorities. There is no need for any MITM certificate and even if there was, these companies woul

Facebook (et al) already hand over user data to UK and other authorities. There is no need for any MITM certificate and even if there was, these companies would just do it since it makes it easier for them to say to authorities they already have the key to read it without involving Facebook - instant plausible deniability for Facebook to say we don't hand over info to authorities and full access for Governments everywhere.