I think if it only included user name, city(county)/ state and egg varieties (duck/chicken or white eggs or colorfull eggbasket ) I don't think it would be safe to have addresses. Let them PM each other for add'l info.
It might look like this
Marty1876 Lyon County, KS duck eggs
SallyEgglady Greenbough, AL colorful egg basket dozens
MightyQualBoy Wawa, MO quail eggs and free range chcken eggs
LooLoos Lassie Honolouou, Hawaii blue/pink eggs only
BuffaloBoy Sowetfeet, MN duck and brown chicken eggs
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The trick might be finding a way to search it by state and county or city area, so that somebody in TX cann find eggs close. In Rhode Island its no big deal, but in TX or AK, thats a whole different story.