How to change your Facebook photo to blue, white, and red for Paris

Since Paris was attacked on Friday night, outpourings of grief and mourning have taken over social media. Now, people are filtering their Facebook photos with an overlay of blue, white, and red — the colors of the French flag. It's similar to Facebook's Celebrate Pride filter, a rainbow overlay that was created for Pride month but became even more ubiquitous when the Supreme Court's decision on gay marriage was handed down. But it's a little more difficult to get. Currently, Facebook hasn't ...