Facebook follows users into every nook with ads: opinion

(FILES) This file illustration photo taken on April 29, 2018 shows the logo of social network Facebook displayed on a screen and reflected on a tablet in Paris. Facebook announced on May 24, 2018 it will apply to its users accross the world the EU's General Data Protection Regulation (GDPR). The GDPR, which comes into effect on May 25, 2018, aims to give users more control over how their personal information is stored and used online, with big fines for firms that break the rules. / AFP PHOTO / Lionel BONAVENTURE

Facebook Inc keeps finding new and potentially annoying places to sell advertisements in its digital hangouts. That's good news for the company's bottom line, but it also may signal weakness. 

Along with Facebook's controversies of late have been a steady drip of disclosures about fresh spots for Facebook's paid commercial messages. The company recently started testing different types of ads in Marketplace, its Craigslist-like section for people to buy and sell merchandise, and in Facebook Stories, its Snapchat-like video diaries.