Twitterstorm from 6pm UK time (8pm Palestine time), Tuesday 5 January. Use the hashtag #FreeIssam.
Demand freedom for Dr Issam Hijjawi Bassalat!
If you want to make any particular points in yout tweets, there is plenty material about his case on this website. It's especially worth highlighting his medical problems - he is in severe pain from a spinal injury and a specialist has recently said that he should have surgery.
The twitterstorm is an initiative by Issam's Spanish friends. It deserves everyone's support. Let's get it trending globally.