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Waltham digital marketing firm Constant Contact Inc. increased revenue 13 percent to $70 million in its second quarter, just beating the average of Wall Street estimates. Net income was $90,000, or flat per share, for the period, compared to a net loss of $462,000 over the same period last year. Looking ahead, the company predicted results for the three months ending in September of 23 to 25 cents a share, slightly below expectations of 27 cents. And it predicted full-year revenue of between $285 million and $288 million.