Even if you set privacy settings to maximum you're still relying on their good faith to operate under those settings. You're also trusting any future buyers of that organization and any current (or future) contractors, temps, network service providers, backup service providers and repair people to honor the privacy terms as stated.
Unfortunately, even if you delete your account(s) with Demographics Collectors like FaceBook the info you had up originally is already captured in perpetuity so just deleting it isn't necessarily the best way to go.
A better solution (than deletion) is to start a process of Demographics Obfuscation by screwing up the Demographics information already out there about you. Start by immediately changing peripheral information about yourself.
At first, leave alone your Name, Address, Phone, DOB and other key identifying information (if already given). Instead, change many of the less important detail characteristics and leave that profile out there for a few weeks. Then change your DOB by a few days. A bit later, change it again by a few more days and also change a few peripheral details. Later again, *delete* your address and change your phone number by a few digits. Keep following this process over a few months.
Once you've put up enough 'garbage' info about yourself over time the Demographics already collected on you in the past will start to become questionable as the newly scraped information will now replace much of it. There may even be several individual profiles based on your name and address, each appearing to be a different person. Once you've scribbled all over their data, then delete the accounts.
(NOTE: Since any Real Property information is generally a matter of Public Record (like your Home) that information will remain out there - but it will now be attached to a good deal of misinformation across the web.)
I just checked Spokeo.com about myself and found the information there is totally messed up and worthless! The only information they got right was my home address and phone number - things attached to my public Real Estate records anyway.
Oh - and a side note on Demographics Collection...
Be aware that many/most of those phone calls you get asking for your opinions on Political Issues, Politicians, TV Ratings & Preferences, Pets you own, etc - are actually just Telemarketing businesses collecting Demographics about you. They then attach it to other information they've already gotten on you and sell it/you as widely as they can.
If you still want to risk it (to voice your opinions) then when they say they're from ABC News, NBC Broadcasting, Gallup, Zogby, (etc) you can simply ask for their phone number. If legit, they should be willing to give you their own phone number so you can call them back after you reverse-look-up that number up online.
Personally, I just say "I don't give out Demographics information" and hang up.