Online Publishers Association: "The Internet Activity Index (IAI) provides a new way of looking at consumer engagement online, dividing Internet usage into four distinct activities: content, communications, commerce and search, defined as follows:
Content - Web sites and Internet applications that are designed primarily to provide news, information and entertainment. Examples of those included in this segment are CNN.com, ESPN.com, Windows Media Player and MapQuest.
Communications - Web sites and Internet applications that are designed to facilitate the exchange of thoughts, messages, or information directly between individuals or groups of individuals. Examples of those included in this segment are Yahoo! Mail, AOL Instant Messenger and MSN Groups.
Commerce - Web sites and Internet applications that are designed for shopping online. Examples of those included in this segment are Amazon, eBay, Shopping.com and Dell.com.
Search - Web sites and Internet applications that scan the Web to provide prioritized results based on specific criteria from user-generated requests. Examples of those included in this segment are Google Search, MSN Search and Yahoo! Search. "
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