What's thing changed when social network appear

When i read a news on Zing.vn ,and i think i should write about this topic
1. Fackebook or Twiter... is one of the biggest news in all the world. It doesn't permitted admission from goverments
2. Communication protocol changed
*) People and People : Friendship , lover...
*) customers and companies
*) People and goverments
Reference these statistic data in this link
https://zephoria.com/top-15-valuable-facebook-statistics
3. Changing behaviors who are using social netowrk
- Spend much time for connections via social network === > Less taking time for family or talking , other activies outside
Referen this link
- Waiting message sydrome
4. Sale and PR activies
- Because Facebook , twiter... have hunders millions user , that's primary channel to reach customers
- Based on broadcast channel of social networks, a product can reach to million potential customers