Whenever viral “challenges” or activities spread on Facebook, we invariably get asked by many of our readers about whether it is safe or not to get involved.

With countless variants of scams operating on the Internet’s largest social networking site at any one time, it’s hard to blame people for being a tad cautious before engaging in a challenge that involves them uploading their own photos to the Internet.

With this 7-day challenge, Facebook users are invited to upload 7 photos over the course of 7 days (so one a day.) All photos have to be black and white, not feature people, have no explanation and must challenge another Facebook users to do the same (helping the challenge spread across Facebook.)