I would be happy to get analytics on my posts. I am by far not an expert content producer, and I honestly just do it for fun and not care much about the rest. However, getting some numbers would be lovely pieces of information (I like numbers), especially to get a better grasp on what my followers like and what they don't.
Now in terms of data storage, as long as I can choose what is stored and what is not and that everything is opt in, I am all in.