Dear parents: your kids are fine, especially when they are 25 years old. When they go for a vacation to Peru to enjoy themselves, odds are they will not have access to Facebook. You don't need to get the Peruvian government to look for your grown-up son and his girlfriend.
Dear kids: you know your parents better than anyone else. If your parents are the type who used to embarass you in front of your friends in grade-school, please call your mother at least now and then. Failure to do so will result in the most embarassing episode of your life plus eternal guilt trips.