Yahoo and Social Networking

Just read
"Facebook Is Not Only The World’s Largest Social Network, It Is Also The Fastest Growing" from techcrunch.com and missed yahoo(company with largest mail user base) in list. Remember Yahoo 360 and Yahoo mash. I neither see process in putting down Yahoo 360, nor in making YahooMash publicily available.

Update(Oct 14,2008): Yahoo did it again. They have launched another social network, called SpotM. Source: Pluggd.in and Techcrunch