The hashtag #JesuisCharlie generated milions of tweets and Twitter France reported more than 5 million. Within hours of the attack at the French satirical magazine Charlie Hebdo in Paris, the hashtag #JesuisCharlie began to appear on Twitter and other social media networks. This image was published by Twitter to show how the world spread around the hashtag on Twitter.

What do you think about using a hashtag?

Do you believe that using a hashtag can be a feature of the liberty of expression?