© Stephen Lam/Reuters
A leaked, confidential document has exposed Facebook's unsavory and often predatory advertising practices which target teenagers as young as 14 and preys on their insecurities. The social networks has denied the allegations, however.

By monitoring users' posts, media uploads, interactions on the platform, and their overall internet activity, the social media giant can establish when users are feeling "stressed," "defeated," "overwhelmed," "anxious," "nervous," "stupid," "silly," "useless," and a "failure," the confidential document states, The Australian reports.

The Australian has published a series of articles detailing questionable practices by Facebook in the country, with the latest 23-page document, marked "Confidential: Internal Only," providing unprecedented insight into how the corporation interacts with advertisers who use the platform.

"We have opened an investigation to understand the process failure and improve our oversight. We will undertake disciplinary and other processes as appropriate," a Facebook spokeswoman said in a statement sent to The Australian at the weekend.