1. Facebook : ksangji p

2. 2003~PCSNS(Social Networking Service)friendster ,myspace,twitter,facebook2010~SMS(Smart Message Service)Wechat,Line,2013 3. SMS Line1LINE 19 monthsTwitter49 monthsFacebook54 months LINE Comm 4100 750 500 4. SMS textemoticon stamp 5. SMS unique EntertainmentfuncompeteGamerewardreal time Communicationintimacy 6. SNSSMSTwitter 7. CM () () () () Critical Mass (20%) 8. .....SMS.