MatrixCombined/CRW

• Flickr
• Smugmug
• LiveJournal
• Squidoo
• Yahoo Groups and similar services
• MySpace
• Tribe.net
• Friendster
• Blogger
• LinkedIn, quite similar: xing.com
• Fark.com
• Wikia.com
• cruxy
• OKCupid is more RW and less C than most dating sites
• deviantART