You don't show solidarity by changing your appearance. You show solidarity by commiting meaningful actions. Open a YouTube channel and speak up freely. Host an event at the university in which you teach. Create a Facebook Group or Fan page and start a discussion. Seriously, show solidarity without show-off. Then and only then it will be a true solidarity and not "how to get attention in 2015". Same stupid thing with French flags on Facebook... Russian airbus got hit, no one used Russian flag. Thousands die daily in Iran, Iraq and Afghanistan region. Hundreds of thousands flee from different countries to save themselves. Yet, no one has ever worn their flag up. So pretentious..