If you use Facebook.com, this is for you.
David Carroll, an associate professor of media design at Parsons School of Design, posted the warning below on Twitter. I checked my Facebook settings and this specific advertisement setting had indeed been changed. So, check yours today. It's fast and easy. It will take at most half a minute to check and change it.
What's driving this activity by the social network? The Washington Post summarized the situation well when it discussed new ad features the site introduced in 2014:
"Things are about to get better for Facebook customers! Not you. You are not a Facebook customer. Advertisers are Facebook customers. You are part of the Facebook product... Facebook, at its moneymaking core, is a system for showing ads to people... why we’re seeing this is because Facebook is not a social network. It is an advertising network... And it seems to be banking on what is always banks on: our unwillingness to change any default settings or think about the flip side of data sharing."
Now, go check and restore your ad settings to maintain privacy.