News roundup: U.S. private employers add 135K jobs in May, survey says … U.S. worker productivity shows modest growth in 1Q … Most parents show little worry about media use by children, study shows

By the numbers: A private survey shows U.S. businesses added jobs at a sluggish pace in May. Payroll provider ADP reports that companies added 135,000 jobs last month. That's higher than April's revis…