"If you are a security researcher in the UK and the government finds out you have discovered a vulnerability, then it appears you can be forced against your will to hand over your research to GCHQ. It also appears that if you then still try to warn the vendor after being served a warrant, the government can prosecute you"
https://www.theregister.co.uk/2017/05/31/surveillance_law_compulsion/
Trying out Amaroq (https://github.com/ReticentJohn/Amaroq) by @eurasierboy -- an iOS client for Mastodon