According to the Register, a total of 2,500 Londoners have been arrested over the past five years for allegedly sending “offensive” messages via social media. In 2015, 857 people were detained, up 37 per cent increase since 2010.

https://www.independent.co.uk/news/uk/arrests-for-offensive-facebook-and-twitter-posts-soar-in-london-a7064246.html