Answer:
Social Networking Sites, the internet
Step-by-step explanation:
To measure the success of a website two main criteria the number of clicks it generates and the amount of time engaged with the site.
Free social networking sites depend on ad revenue. A person/organization buys advertisements on the basis of clicks or views. That means say for a certain number of clicks or views a certain amount of money is paid and this money is paid to the sites.
When people did not know what a hoax was, people clicked on those links or ads and believed in them blindly. Now, it was not in the best interest of the site owners to take those links out as the algorithm running in the background would make sure that you were engaged and the ads on the side kept playing. If you were clicking links to sites with hoax news then you would be given similar news sources in your feed. This creates a viscous cycle of spread of misinformation.