Wehether we make that spread of informationlegal or not does little to affect whether it happens.
There are two things that might help. First, don't share as much information. Once it's no longer limited to you or your close group of friends which hopefully won't share it along with your name, it's mostly out of your control. Second, put limits (laws) on what information companies are able to synthesize about you, and how long they can retain it. If there's less information created about you (or it's ephemeral, created and destroyed as needed), and if they need to clean out older data, there's less to be shared or stolen.