what's it called? - make your own skin care products kit

As usual, I know what I want and I don't know what it's called or where to find it!
I am creating a website where members can have their own editable pages/blogs in my blog.
Obviously, I don't want every member to be able to edit anything in addition to their own area.
They need to be able to edit text and add images etc.
Just recently I saw some emails about having my own social media sites and software --
I don't know if this is what I need either!
Have you seen any software that can help me?