When Tommy Robinson was detained last night, he was arrested by @metpoliceuk for these social media posts.

S179 Online Safety Act - Without reasonable excuse sent a message conveying information known to be false intending, at the time of sending, the message, or the information in it, to cause non-trivial psychological or physical harm to a likely audience.

S127(1) Communications Act - A person is guilty of an offence if he:
(a)sends by means of a public electronic communications network a message or other matter that is grossly offensive or of an indecent, obscene or menacing character; or
(b)causes any such message or matter to be so sent.