Three dominant themes
1.Leverage existing web primitives – “with blogs and email, we already had a decentralized social network.” — mentalgear
2. Social value lies in usage and niche focus – “The biggest lesson I take is that ‘social networks’ are not about protocols but about how we use the existing infrastructure.” — TimFogarty
3. The web itself functions as a social network – “Been saying this for years. The www is already a social network.” — rambambram