Twitter? No problem. The Ahmadinejad government- I hesitate to say 'regime' out of a probably-misplaced sense of impartiality- can shut that down without all that much trouble.
Green Revolution? No problem. They had some significant difficulties handling that, but the Ahmadinejad government has beaten them down considerably over time.
Non-governmental, purely economic-related protests and strikes in the Tehran bazaar? (And all for around ten bucks?) PROBLEEEEEEEEEEEEM!