Peoria public affairs specialist Stuart Robinson manages the city's Twitter account from his office at city hall. Robinson uses the account to distribute information about city operations and to respond to questions from the public. (Cronkite News Service Photo by Jennifer Gaie Hellum)
Cassandra Byrd, with her son Kyle, left, and daughter Lauren, right, in her home in Phoenix. Byrd frequently uses Twitter to seek information about handicap accessibility at locations around the Valley.
By Mark Scarp, contributing columnist
By Jerry Brown, contributing columnist
Guest Commentary by Bill Richardson
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By Mark Heller, Tribune