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The battle in the online dating service business has become as competitive as the contest among looking-for-love singles angling for that final rose from “The Bachelor.”

Market leaders like Match.com, a unit of USA Interactive, and Yahoo Personals, are now turning to well-known creative shops and significantly increasing marketing budgets. Their ads are now showing up in prime time on shows like “The West Wing” and “Joe Millionaire,” while promotional efforts have paid off in placements like Match.com’s on the six-part series on dating appearing on “Today.” More…