My husband posts things about our personal life on social media and I'm going to tell him to delete them.
What's your reason for wanting him to delete the things he has posted?
I don't want anyone to know anything about my personal life.
That is understandable. I wouldn't want all my personal info shared on the web either.
I want to keep complete control of what is shared about my life on social media.
Some people are more private then others and your feelings about limiting what your husband shares about you is reasonable. Let him know how you feel and I'm sure he'll be understanding and delete the things that make you uncomfortable.