I was invited by someone to join a social networking web called LinkedIn, which, as it claims, essentially builds an online social network of many executives, industry professionals, and of course head hunters. Other famous social networking sites are:
It looks like individual social networking sites are being integrated into other somewhat general purpose sites as part of the offerings. For example, Yahoo is likely to provide Yahoo online community services along with Flicr and the incoming Yahoo 360, which allows a user to blog, share pictures, get involved in collabarations, etc. Bottom line is, web based social networking software could be an effective way to extend user basis of these sites.
