Wow. This is so revealing. We often throw away our sense of privacy in the name of socializing, especially with those you do not normally wanna share your thoughts or data with.
The fact however is that most of these companies can't be sued because you signed a terms of use agreement when you signed up for the use of the platform. Almost everyone do not bother to consider the contents of those agreements.
It's good you have pointed out how to check and uncheck our accounts to make it more secure. I can now make my account as safe as possible.