A recent push in the IT industry to collect and monetize big data is headed for a clash with privacy concerns from Internet users and potential regulation from some governments, according to tech analyst firm Ovum. Internet advertising networks and other companies that depend on the collection of personal data online should prepare for a "rebalancing" of the relationship between themselves and Web users, with Web users having more control of their data, said Mark Little, principal analyst at the U.K. tech and business analysis firm.