ROMULUS, Mich.-At any time of day, expect to see Amy McGraw pecking away at her BlackBerry on Twitter, "tweeting" with her members about the Mexican restaurant where she's eating or a movie she's about to see.

"I have a lot of conversations with my members on Twitter, 24/7," said McGraw, who is the marketing director at $123-million Public Service CU (PSCU) here and whose work was featured in a New York Times article in June. "Many of the conversations are not related to credit union business. If I had to guess, I'd say that 70 to 80% of my tweets are more relationship and the remainder are marketing support."

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