Just came across this site and a fast-spreading idea that began in London.

"We  Are Not Afraid" is a neat Word-Of-Mouth campaign  in response to the terrorism that London experienced.

The site declares, in manifesto style, that:

We are not afraid to ride public transportation.

We are not afraid to walk down a crowded street.

We are not afraid of each other.

We are not afraid to say that terrorism in any form is never the answer.

The site allows people to upload images that illustrate the idea, as in the one above. Contributors should note that no images depicting revenge, religious iconography, swear words etc will be accepted. Take a look at the dozens of submissions from around the world. Some are simple Photoshopped images, but some are very clever. There are some 400 galleries, as of today!

Also see the Tube Relief site, and this link, for a similar use of the existing London Underground logo, being adapted to this grassroots campaign.