One to One Interactive, a Massachusetts-based digital marketing firm, said Monday it has agreed to merge Twelve Horses into its OTOi and OTOlabs divisions.

Twelve Horses has operations in Salt Lake City and the Reno/Tahoe area of Nevada. Terms were not disclosed.

Twelve Horses provides Web site design and development, marketing, business process automation, customer relationship management, search engine optimization and search engine marketing. With the merger, One to One Interactive will have offices in Baltimore, Reno/Tahoe, Salt Lake City and London. It is based in Charlestown, Mass.

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