business , chat , collaboration , enterprise , project-management , social-networks , web

alternative , ecommerce , economics , facebook , social-networks

Google , books , facebook , internet , social-networks , video

free , games , social-networks , status

analysis , research , search , social-networks

CMS , Communications , application , collaboration , free , ning , social-networks

facebook , social-networks , video , web

books , cognitive , complexity , network , review , science , social-networks , technology

art , ecommerce , marketplace , social-networks

location , news , social-networks , travel

aggregator , beta , social-media , social-networks

facebook , identity , openid , social-networks

aggregator , distributed , identity , protocol , social-networks , standards , streams

academic , collaboration , community , education , research , science , search , social-networks , web2.0

ning , social-networks

ning , social-networks

alternative , collaboration , community , culture , economics , marketing , social-networks , travel

RDFa , facebook , metadata , protocol , semantic-web , social-networks , web-development

authentication , opensource , social-networks

Google , Yahoo , aggregator , collaboration , community , forum , free , groups , social-networks , web2.0