marktag.com书签: everyday / Recent bookmarks posted to marktag.com书签 60 There - the online virtual world that is your everyday hangout - http://www.there.com/ 一些非开源的虚拟世界已经存在了，比如Second Life，There.com和Active Worlds MarkTag.com Wed, 16 Jan 2008 17:02:53 +0000 everyday hangout online there virtual world