I don't have examples of tweets handy, but here are stickers that get you 2 years in UK jail: They reportedly contained slogans such as “We will be a minority in our homeland by 2066”, “Mass immigration is white genocide”, “intolerance is a virtue” and “they seek conquest not asylum.”

Sources:

https://www.bbc.com/news/uk-england-leeds-68448867 (does not quote a single sticker that he was jailed for)

https://www.gbnews.com/news/sam-melia-free-speech-activists-...