Social Networks in the Yahoo! Directory

Foursquare
Geosocial networking application allows users to connect with their friends, update location, and earn reward points using mobile devices.
foursquare.com
Facebook (2)
dir.yahoo.com/.../Social_Networks/Facebook
MySpace (58)
Explore the sites of MySpace, the virtual community, including the home page, its music portal, editor and toolbar wizard, the technorati's portal blog, and articles about the virtual community.
dir.yahoo.com/.../Social_Networks/MySpace
Flickr@
Find a collection of sites relating to Flickr, an online photo management tool where users can share photos, store, search, and sort photos.
dir.yahoo.com/.../Photo_Albums/Flickr
Twitter (25)
dir.yahoo.com/.../Social_Networks/Twitter
Google Groups [read review]
Google Groups allows users to start their own email discussion groups and message boards, and browse archives of Usenet groups.
groups.google.com
Yahoo! Groups
Yahoo! Groups allows you to create and manage online email communities in areas such as Recreation and Sports, Entertainment and Arts, Hobbies and Crafts, Computers and Internet, and Health and Wellness.
groups.yahoo.com
StumbleUpon
A browser add-on for finding and sharing great web sites.
www.stumbleupon.com
CouchSurfing [read review]
Helps users make connections worldwide. Meet people from other countries and offer your couch to your new friends when they visit.
www.couchsurfing.com
orkut
Online community that connects people through a network of trusted friends.
www.orkut.com
Friendster (7)
Social network sharing profiles, thoughts, photos, and opinions.
dir.yahoo.com/.../Social_Networks/Friendster
Ning
Online service where users can create, customize, and share their own social network for free in seconds.
www.ning.com
Bebo
Bebo is a social networking website where users can share photos, music, videos, and more.
www.bebo.com
hi5
hi5 is a place to meet new people, connect with friends, show off your photos, listen to music, build your own page, and share ideas.
www.hi5.com
Meet Up
Connects people around topics of interest locally.
www.meetup.com
FriendFeed
Make a customized RSS feed of photos, videos, links and share it with a group of friends.
friendfeed.com
Dogster [read review]
Post and share your dog's photos and facts. Site enables viewing by breed, size, name, hometown, and more.
www.dogster.com
Mixx.com
Mixx.com is a personalized user-recommendation site where readers can find stories, photos, videos, news, shared interest, and more.
www.mixx.com
eSnips
Social music, video, and photo and sharing site where people can upload media, share it with friends, and access it remotely.
www.esnips.com
Stickam.com
Broadcast yourself live. Add live feed, video chat, movies, photos, and audio to your web page, MySpace page, or blog.
www.stickam.com