Three online marketing firms have joined the Online Publishers Association (OPA) as associate members. The firms are media and research firm DoubleClick, marketing and technology provider 24/7 Real Media, and data integration software company Tacoda Systems Inc.
The OPA started its associate member in December 2001 to allow companies that provide functions ancillary to the online publishing business to participate in its activities. The OPA was founded in June 2001 to advocate the interests of the online publishing community.
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