CBs and HAM radio allow you to connect with others if you have a power source for those devices, but they're rarely going to connect you to everybody you might need to speak with. If someone has a Nextel phone, the radio function might work even if cell service is down. Failing all the tech stuff, you may have to go see the person you need face to face, if the conditions permit. Every family and group of friends should have one designated meeting place in case of emergency; a place where you could leave notes for each other would be ideal. In the realm of survival, you can almost always come up with shelter, water and most other needs, if you are resourceful. It's communications that are the hardest thing to replace when they are suddenly and unexpectedly gone.