Amazon's Mechanical Turk used increasingly for spam

Amazon's wonderful Mechanical Turk is developing a serious spam problem, writes Panos Ipeirotis:

Amazon Mechanical Turk has reached the mainstream. Pretty much everyone knows about the concept. Post small tasks online, pay people cents, and get thousands of micro-tasks completed. Unfortunately, this resulted in some unfortunate trends. ... A seemingly endless amount of spam comes to the market, mainly with the purpose of spamming "social media" metrics.

This is why random marketing people have more Twitter followers than rock stars. The Turk, however, also performs many useful functions. I hope it doesn't go the way of Delicious.

Mechanical Turk: Now with 40.92% spam. [Panos Ipeirotis via Waxy and Hacker News]