If you've ever signed up for an account on a Web 2.0 site, you've seen it: The ugly little image that appears after you've plugged in your desired user name, password, and email address. They're usually either ridiculously colourful, lying on a gridded background, or both. Annoying as they may be, these CAPTCHAs are included in the account creation process for the sole purpose of making sure you're human. CAPTCHA is a fantastic acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart," but I like to just call it the "human test."


MySpace verification image
MySpace's ghastly test as to whether you're human enough to create a profile


As if it's not frustrating enough to be told that the user name you've invented is already taken and that you didn't enter a valid zip code, these human tests are sometimes as illegible to real people as they hopefully are to bots and image readers. However, I have a newfound respect for CAPTCHAs (and the other assortment of human tests out there) after taking a tour of Shadows.com today.

Shadows is a social bookmarking site along the lines of Digg and Furl, but with some extra, aesthetically pleasing features like screenshots of saved links. On entering the site, I went to their search engine to see what links people had saved for certain keywords. I didn't immediately take a look at the home page, which lists the ten most recently added links.

Everything loaded awfully slowly and I couldn't work out why. However, upon wandering back home, I saw ten identical links, posted by users whose names varied from "ttru3i2" to "ttj894g5h3ui3ergh625". Apparently, these Shadow members were very interested that the site's visitors know about colon cleansing websites. Later in the afternoon, visitors were treated to a barrage of online casinos.



The invaluable information available this afternoon on Shadows.com


It didn't take long to dawn on me that there were two reasons for this gross display of spamming:
  1. The Create Account page does not require a valid email address ([email protected] will do). Thus, Shadows does not require new users to retrieve an email and click on a link to verify their accounts.
  2. There's no annoying CAPTCHA text to retype.
It's a real shame that Shadows has left itself open to this type of abuse because it's a potentially good social bookmarking tool. Perhaps they think they've been user-friendly in cutting down on the time spent squinting at colourful images or following up on confirmation emails, but they aren't actually doing anybody a favour.

If the Shadows team rectifies this problem, their site will become infinitely more usable, popular, and credible. In the mean time, it's the place to go if you're into online gambling scams and are having problems going to the bathroom.