I don't give out my number until all the details are worked out, and a meeting time and place are all arranged. I work out all the details through email, and wont deal with anyone who seems the least bit weird or pushy. I've had mostly good luck doing it this way, and have sold many eggs, hatching eggs, chicks and roosters on there. I'm also super paranoid, so always meet in public during daylight hours. Most people are nice, but the weirdos are out there,too. You can't be too careful!