[zzyzxd]

What these companies worry about is not free information. Their concerns are usually around company IPs, copyrights, reputation/branding...etc.

Do those risks exist? Sure. But it's silly to blindly forbid your employee's outside-business activities like this. However, in this job market, employers probably can easily find candidates that don't have problem with this silly restriction so they don't have incentives to allocate resources to deal with the headache.

A personal website may sound too "professional" to a legal person. I bet OP could post the same information on facebook/twitter without getting into any trouble.