How do I separate my construction personal life from my professional life if I am using an on-line network.

Be very careful about content. Many people use on-line networks to present their construction personal passions, to journal on a construction personal level, and to socialize in an environment where they don't have to see other people face-to-face. If you engage in such a site, make sure you are presenting a face that prospective construction employers can trust. We live in a world where construction employers can and will Google your name. Make sure what they see is something that will recommend you.