Yahoo, which was keeping data about user's Web searches for 13 months, said it would limit most of that data collection to 90 days after an uproar in late 2008. Some say Yahoo's partial deletion of IP (Internet Protocol) address data is still not enough to protect consumers, and called for complete deletion.
Google and Microsoft also agreed to reduce the length of time the companies kept such data, but not as much as Yahoo did. Google agreed to nine months and Microsoft to six months, both down from 18 months. (Msnbc.com is a joint venture of Microsoft and NBC Universal.)
Personal Comment: Retention of user data should not exist longer than necessary for particular purpose, but I think that it depend on the nature of business involved. For example, banking industry will keep the transaction history for customer because there are possibility that customer need to revise their transaction in few months ago or even few years ago. It is a wise step for yahoo, google and microsoft to reduce the period of data retention,it will increase the confidence level of the users in using web. PDP Act 2010, Principle 6:Retention of Personal Data. Data held for any purpose shall not be kept longer than necessary for that purpose.
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