This week here at Twitter HQ we were lucky to have Mark Horvath, @hardlynormal, of Invisible People come into Twitter and talk about his work using social media to empower the homeless population in the USA.
Mark was finishing up a cross-country bike tour to raise awareness, and joining him in the office was his film crew, who are working on a documentary about his work.
Check out more of his work:
Mark was finishing up a cross-country bike tour to raise awareness, and joining him in the office was his film crew, who are working on a documentary about his work.