MUNICH – When a local radio station in Charlotte, North Carolina started a podcasting competition in its community, it was prepared for many contingencies, except one: that the response would overwhelm the station’s server. The initiative was aimed at increasing on-air diversity, and tens of thousands of people wanted in. Groups and individuals from all walks of life submitted more than 370 ideas for podcasts, and 33,000 listeners logged on to vote for them. What started as a one-time experiment will now be a regular feature.