Desperate For Revenue, Facebook Turns To The Gambling Business

Since the article below puts gambling addiction in thesame fold as drug addition:

Title: The neurobiology of pathological gambling and drug addiction: an overview and new findings: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607329/

Is Facebook harming society by this new act of desperation or is Facebook exposing its users to a new habit that could be destructive?