Tweeters have joined forces to support Paul Chambers, the man convicted and fined for a Twitter message threatening to blow up an airport.
The Twitter community is angry that the 27-year-old accountant has failed to overturn his conviction.
A day after his appeal failed, two "hashtags" to highlight his situation remain top topics in the UK.
Free speech advocate Index on Censorship said the UK judiciary was out of step with social networks.
"The verdict demonstrates that the UK's legal system has little respect for free expression, and has no understanding of how people communicate in the 21st Century," said the organisation's news editor Padraig Reidy.
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