Get your own here: ffrf.org/out
You might live in the UK, Iceland, or New York City where it's not unusual to meet an atheist. This isn't true in Texas and many other places. Most people who meet me are unaware of my lack of belief in gods. Many of them would be horrified to learn of it.
Text from the FFRF (Freedom From Religion Foundation) page:
"Although the nonreligious — including one in four U.S. citizens — is a significant segment of the world population, many Americans have never knowingly met a nonbeliever. You can help dispel myths, educate and promote reason by adding your voice, face and message to FFRF's friendly neighborhood freethinker campaign. This is your chance to proclaim you're a freethinker and why... Now it's time for atheists and agnostics to come out of our closet. Many faces make Enlightenment work."
I "came out" as an atheist in early 2015, via a special section on my website, which I linked to across my social media accounts -- much to the chagrin of many family members and quite a few old friends. Few expressed support. (The response from Flickr friends -- here -- was better than elsewhere.)
Part of the reason I "came out" was so that people who know me would realize that someone they know is an atheist. This is important to lessen the demonization of atheism in our society.