Some migrated from Myspace and other networks, but Facebook was able to capture the invaluable older demographic who had never used social networking before and are less inclined to switch. Facebook was able revolutionize communication much in the same way the car did for transportation.
Facebook was able to capture the invaluable older demographic
Yes and no. It captured people while they were 20-somethings and has so far managed to hold onto many of them into their 30s and even 40s via its networking effect. But the last thing the next generation want to use is something that the previous generation used. So it's a blessing and a curse.