So it is possible to delete your account "completely". I did this once and I have never been more happier. I actually spent time being tense when Facebook rolled out a new privacy blunder and would rush to check all settings. Imagine the time wasted.
So to all those who are contemplating deleting the account but can't - do it. It's totally worth it.
Although, I hear that the EU (or maybe just the UK?) has strict provisions around keeping data, and so those users who choose to delete their account really do have their data wiped. But not the rest of us.
1. https://news.ycombinator.com/item?id=3145987
2. http://blogs.wsj.com/digits/2013/08/29/facebook-reminds-user...
Certain information is needed to provide you with services, so we only delete this information after you delete your account. Some of the things you do on Facebook aren't stored in your account, like posting to a group or sending someone a message (where your friend may still have a message you sent, even after you delete your account). That information remains after you delete your account."[1]
"Maybe that was true in the past, but today when you delete your data it is gone. Trust me, I wrote it myself. The law enforcement guidelines that have been circulating recently corroborate this."[2]
I do wonder what sort of "things you do on Facebook" aren't stored on your account, though.
[1] https://www.facebook.com/about/privacy/your-info#deletion
That is Facebook's core problem. They are the boy that cried wolf. We have seen them lie about privacy. We have seen how they have eroded our privacy, sometimes deliberately and sometimes by mistake. More importantly, we have seen them make these invasions into our privacy, and genuinely not seem to care.
The take-way from this, is that Facebook has become untrustable. As more people realize that, the more people will start deleting their accounts.
The challenge is (as a person that has deleted their Facebook account), is that you have to overcome the addiction and then the deal with the loss. You have to finally accept that the things you think you are missing out on really aren't that important. I personally found this quite hard to accept.
Giving up Facebook and giving up smoking are relatively similar, and I've done both.