of individuals. A report on such activity was published in The New York Times [@Caldwell2007]. The method of control is a crucial difference in these efforts. As we will see some in Section \[Sec:signup\] clients buy hundreds or thousands of accounts that they can use themselves. In this case there are technical possibilities to detect the puppetry, by noticing when a very high number of users are logging in from the same network location or use the browser client fingerprint [@Laperdrix2016].

But the method of control can also be an order from a client to a cohort of users to perform some activity (but the client itself never logs in to any of their accounts). In this case detection of the activity is much harder if the client takes some precautionary steps (see Section \[Sec:signup\]). Sometimes this is called meet puppetry [@Cook2014] referring to the fact that it involves real freelancers.

Click farming is another related term. Click farms are actual workplaces in developing countries where a large number of employees are performing short task sometimes for as low as 1000 likes for 15 USD[@Arthur2013]. In current reporting these are often called troll farms [@Smith2018].

The platform investigated by this 