Generally the reason you have the inside track is that you're trusted. You need to respect that trust to maintain it.

Confidentiality is an important requirement in a client-agent relationship, and it's implied in your relationships with the community as well.

Often developers will share things with me before the information is made public. I always ask a) may I share this with my clients and b) is this something I can blog about? and I always respect their answers. Similarly, when I have multiple clients in a building or neighborhood, I'll ask them if I can share their information with my other clients - which may be a sales price before closing, coming price reductions, or information passed on to them by their attorneys.

Whether it's questions on a new shop or photos of a customer - always ask permission to share, telling them where you plan to share it.