E.g. Joseph Kelly was sentenced this year to 150 hours of unpaid work and 18 months of supervision for a “grossly offensive” tweet which went viral (he deleted it after 20 minutes).
This the first I've heard of this and I assumed there must be more to it. After some Googling I'm shocked that someone can be sentenced in the UK for a mildly offensive tweet (IMO) that went viral before it was deleted in 20 minutes.