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Aggregate Knowledge, a company that gives recommendations based on aggregated user behavior has raised $20 million in Second Round of funding from DAG Ventures, while previous investor Kleiner Perkins also participated in the round. Aggregate Knowledge has previously raised $5 million in First Round of funding and has also received angel investment from Josh Kopelman.The company has been valued north of $70 million, which is really healthy.

The company works with content and eCommerce sites and provides recommendations to the users to visit a certain page or make a certain sale. It does so on the basis of similar behavior expressed by other users. The company has 15 customers, including Overstock and Wahsington Post and is generating millions in revenues for them. The company will be launching a new product called Collective Discovery, that apply similar patterns to discovering products. Like if you have read a useful soccer article from one site, Aggregate knowledge will recommend buying a ticket from another site.

Similar service include Wunderloop, Baynote and industry leader Omniture which also recently bought Touch Clarity

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