NBC News’s chief foreign correspondent Richard Engel posted the above photo last week on twitter from the protests in Egypt and has quickly become viral. The social site has helped thousands of egyptians communicate and organize for the removal of President Hosni Mubarak. The photo emphasizes what social media means to people from all over the world, especially those in crisis.

The tweet read:

@richardengelnbc: #egypt. Egyptian protester holding sign ‘thank you facebook’ http://yfrog.com/h3g76hj