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Re:Ask HN: A tool to share bookmarks with only my company? by joel_liu on Tuesday August 11, 2009 @11:16PM (#757177)
Diigo have a group bookmark feature which may fit your needs.
Re:Ask HN: A tool to share bookmarks with only my company? by TweedHeads on Monday August 03, 2009 @01:41PM (#739678)
Great idea, there are plenty of personal web services that need a business clone and del.icio.us is one of them, same as wikis, twitter, etc.
Re:Ask HN: A tool to share bookmarks with only my company? by booticon on Monday August 03, 2009 @01:52PM (#739721)
RE: Wikis: Wikipedia runs on MediaWiki, and is very easily installable on an intranet environment: (http://www.mediawiki.org/wiki/MediaWiki)

RE: Twitter: Yammer. (https://www.yammer.com/)