Use Occupier.hk/StandByYou to show your support to the protestors in Hong Kong directly via twitter. Your tweets are projected in realtime on a large wall in the current area of protest. This is a media art project in solidarity with the Occupy Central with Love and Peace action, by 'Add Oil' Machine' Sampson Wong. It works quite well, but lacks the website showing an image of your message on the wall, probably due to limitations of electricity/data and ability to lug gear around. You can however see all the previous messages on the website, and if you follow #occupycentral hashtag you'll see people tweeting photos of the messages and other events in Hong Kong right now.