Social networks allow people to connect online by creating personal profiles and finding friends. Early social networks from the 1990s like SixDegrees and Classmates allowed users to share profiles and friend connections. Modern networks like Facebook and Twitter allow sharing of updates, photos, and videos between friends. Successful social networks provide benefits like anticipated reciprocity, increased recognition within a community, a sense of efficacy from contributing, and a sense of belonging to a community.

1. Social Network
Social Network
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............... sql
video
............... Social Network
Social Network

2. ............... Classmates.com
1995 SixDegrees.com 1997
1999 epinions.com Jonathan Bishop
Social Network ?

3. Peter Kollock Contribute
Online Communities 4
1. Anticipated Reciprocity -
Online Community
Pantip.com
Pantip.com
2. Increased Recognition -
Online Community
Community
3. Sense of efficacy - Contribute
Impact community
A Pantip.com
thanks to aozster
4. Sense of Community -
Online Community
( The Economies of Online Cooperation: Gifts and
Public Goods in Cyberspace" Peter Kollock)

4. ?
............... Social Network
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