https://medium.com/@GadgetHax/how-to-delete-your-facebook-account-scrub-your-data-578d273dbc27

With the news that Cambridge Analytica obtained over 50 million Facebook users’ information without their consent, there are no doubt many of us considering that terrifying yet alluring endgame — deleting Facebook. While difficult to figure out, deleting your Facebook account is actually a quick affair. You just need to know where to look.

Now, they say nothing on the internet can be erased, but besides the odd message here and there kept by your Facebook friends, your data will be destroyed if you delete your account. Facebook claims they delay deletion request a few days, so if you log back in during that time your account will be saved. However, there’s no clock letting you know when that deadline has passed, so best not to mess with this process unless you’re positive you’re done with Facebook for good.