There are a couple of cases like this, including one about some racist remarks in liverpool -- both were overturned on appeal.
> Chambers appealed against the Crown Court decision to the High Court, which would ultimately quash the conviction.
These are absolutely trivial cases to assume that somehow the UK has suspended the free expression rights of its citizens. These amount to over-reach by the lowest courts (staffed by volunteer judges, fyi) which were corrected. That's about as good as justice is in practice.
(It's also an unaddressed issue on exactly what social media is -- people tend to assume its some private conversation, but its at least as plausible to treat it as a acts of publishing to a public environment. When those actions constitue attacks on people, the UK/Europe have typically regarded public attacks as having fewer free expression protections).
Neverthless, these cases are used by the far right online to disguise what has been action taken by the UK gov against far right quasi-terrorist groups engaged in mass violence. The UK gov is not persecuting people for free expression, they have taken action against people using social media to organise murder.
One should be careful to note where this perception of UK speech laws is coming from. It's not free speech classical liberals.