https://freespeechunion.org/daily-mail-investigation-exposes...
Not all of them are online posts, in fact probably a minority
> The total arrest figures are likely to be far higher because eight forces failed to respond to freedom of information requests or provided inadequate data, including Police Scotland, the second largest force in the UK. Some forces also included arrests for “threatening” messages, though these do not fall under the specified sections. [emphasis added]
https://www.thetimes.com/uk/crime/article/police-make-30-arr... (https://archive.is/kC5x2#selection-3325.0-3325.335)
But the Times article also says:
> A spokeswoman for Leicestershire police said crimes under Section 127 and Section 1 include “any form of communication” such as phone calls, letters, emails and hoax calls to emergency services.
So I think the categorisation is a mess, and probably not even consistent across forces
Do you understand the concept of a slippery slope? Anyone being arrested for online posts is too many from a free speech absolutist pov.
Wikipedia by itself is not a reliable source [0].
[0] https://en.ejo.ch/public-relations/manipulation-wikipedia