Google Sidewiki允许任何用户在任何网站发表评论，用户也可以在sidewiki发表自己的见解，提供更多相关的内容和资讯，以便其他用户参阅。Google在09年发布这个项目，但是效果并不理想，日前已经给用户发邮件提示备份数据，宣布将在12月5日关闭此项服务。以下是全文：Google Sidewiki closing down - how to export your entries

Dear Sidewiki contributor,

You are receiving this mail because you have contributed one or more entries to Sidewiki. We have decided to discontinue Sidewiki ( blog post), so we want to make sure you have a chance to export your valuable contributions.

To export your Sidewiki entries, go to http://www.google.com/sidewiki/ and follow the instructions. If you wish to export your Sidewiki entries, you will need to do this before December 5, 2011, after which time we’ll be discontinuing support for Sidewiki and deleting all content.

We’d like to take this opportunity to thank you for using Sidewiki and helping make it a compelling product.

Thanks,
The Sidewiki team