It's a very good point. Facebook has privacy settings, but that can be a pain in the butt. The point of social media in regards to work is to create and maintain relationships. Instead of saying, "I went for a hike in the Rockies," just say that you went for a hike.
When you're working, it doesn't matter where you're working because people go on location all of the time. The fact that you're asking this question eludes to the fact that you're already savvy to keeping yourself under wraps. Keep it up.
For more tips and articles by top entertainment industry career coach, The Greenlight Coach, visit www.TheGreenlightCoachBlog.com