Google稍早已邀請少數網友，參與Knol的封閉測試。Google表示未來會將所有透過Knol產製的內容開放，讓各家搜尋引擎都可以索引。
相關連結：
l Encouraging people to contribute knowledge
http://googleblog.blogspot.com/2007/12/encouraging-people-to-contribute.html
l Google Develops Wikipedia Rival http://www.nytimes.com/idg/IDG_002570DE00740E18C12573B10046E582.html?ex=1355288400&en=d7b37f7838d37ac1&ei=5090&partner=rssuserland&emc=rss
l Googlepedia - Knol is Google's knowledge base http://dondodge.typepad.com/the_next_big_thing/2007/12/googlepedia---k.html
l Google Knols for Your Wikipedia Needs？
http://lifehacker.com/software/ask-the-readers/google-knols-for-your-wikipedia-needs-334131.php
