was focused mostly on Twitter and on the activities of a company called Devumi.

Aims and Methods
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Research aims
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The primary aims of the present research were to identify the different schemes employed in microworker-based gray marketing on microworkers.com and to then categorize them, attempt to uncover how they fit in a wider strategy, estimate their limits and effectiveness, and to utilize this knowledge to provide general insights into these kinds of campaigns.

Second, the scale and typical budget of these campaigns, and their relative share of the overall activity on the microworkers.com platform were also measured and reported herein.

Observation of campaigns
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This research project attempted to observe all campaigns posted on microworkers.com from 22 February 2016 to 21 February 2017. The site was checked several times a day during this period. In total, 7,426 campaigns were observed during the period. Each campaign was manually categorized and the aggregate numbers of categories (payments, number of tasks) were updated.

Categorization
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The campaigns were categorized in terms of two dimensions: the related target platform (Facebook, Google Plus, SoundCloud, Twitter, etc.), and the specific activity (search and engage, like, comment, sign up, etc.). The categorization was based on 