By combining data from a marketing platform with the results from personality tests that users have completed, we know that people with at least 500 friends are likely to be extroverts, and people with less than 500 friends are likely to be introverts. Based on analysis of user-uploaded photos using computer-vision algorithms, we also know that people who are extroverts are more likely to have many photos of dogs, and introverts are more likely to have many photos of cats. Market research has shown that dog people are highly likely to be positively influenced by advertisements for any product that includes dogs, and similar for cat people and cats.

For an already initialized Int variable friendsCount, if a user has more than 500 friends, print the message "Adopt a Dog Today!" and otherwise print "Buy Cat Food At 20% Off".

If you'd like to find out more about targeted advertising, you may find these articles interesting:

• Why don’t we just ban targeted advertising? (Wired) Why the obvious solution to privacy issues is to ban targeted ads, but the solution is not necessarily so simple. (10–15 minutes)
• Targeted ads: the good, the bad, the unavoidable (California Management Review) What are targeted ads, as answered through the lens of Facebook. (5–10 minutes)
• When targeted ads feel a little too targeted (Vox) Shares a brief personal story about experience with targeted ads and the implications it can have on others. (10–15 minutes)
• The case against behavioral advertising is stacking up (TechCrunch) Presents a history of targeted and behavioral advertising, as well as recounting controversial instances of it. (10-15 minutes)