Tag, You're It

There's no hiding from anyone these days, especially your friends.
The appeal of knowing the whereabouts of your friends has generated the enormous popularity of Sniff.

Sniff (the Social Network Integrated Friend Finder) has been very popular in Scandinavia, with around 100,000 users registering in the past six months alone, and it's now available in the UK. It's a new application that can be installed on mobile phones and social-networking sites such as Facebook, providing users with a detailed map of their friends' whereabouts at any given moment.
Sniff: Social Network Integrated Friend FinderTelegraph.co.uk - United KingdomSniff (the Social Network Integrated Friend Finder) has been very popular in Scandinavia, with around 100000 users registering in the past six months alone, ...See all stories on this topic

Also note that socianetwork applications on mobile phones is rapidly becoming the next huge trend.

Another social network creates complete transparency among employees, salaries, and their opinions of corporate culture and company leadership. In the past, discussing your salary was an absolute no-no. Those days are over. Check out www.glassdoor.com

Enterprise social networking - ashyEnterprise social networking: Glassdoor seems to be ...Internet Evolution: Comments - http://www.internetevolution.com

It was just a matter of time before even the most anti-networking types of all, doctors, would want to get into the socianetworking act.
iMedExchange and social networking for doctorsSeattle Post Intelligencer - USASocial networks -- traditionally the domain of the young -- are increasingly moving into the professional ranks. There are social networks for lawyers ...See all stories on this topic

Every type of group, every age, every interest, hobby, language, will be hosting a social network. Will the monetization model change once the proliferation of these sites grows beyond the tipping point? Are all the ads paying off?