The promises made include one by WhatsApp indicating that nothing would change after the Facebook acquisition. "Here’s what will change for you, our users: nothing …. And you can still count on absolutely no ads interrupting your communication," said an email message to WhatsApp members following news of the $19 billion bid. Facebook CEO Mark Zuckerberg added, "We are absolutely not going to change plans around WhatsApp and the way it uses user data."
The letter from the FTC was sent to Erin Egan, Chief Privacy Officer at Facebook, and Anne Hoge, General Counsel at WhatsApp. In the letter, Rich wrote, "WhatsApp's hundreds of millions of users have agreed to use the WhatsApp service and to have WhatsApp collect and transmit their information, with the understanding that these promises will be honored."
WhatsApp members can rest easy, knowing that the FTC has their back in terms of holding Facebook and WhatsApp executives to their word. If WhatsApp wants to change their Terms of Service, the FTC says that it must give members a chance to opt out of any changes, or "at least make it clear to consumers that they have the opportunity to stop using the WhatsApp service."
You can read the letter from Ms. Rich in its entirety, below
source: FTC, Scribd via TechCrunch