Hmmmmm, I think my decisions are based on two, no make that three factors. First posts out of the camera are moments that brought that feeling of awe or joy for me to experience, like my recent encounter with the deer.  I was so thrilled to see her, amazed she didn't just bolt at my first click, and joy when I realized she was just as curious about me as I was about her. Those "oh wow" ones are always pictures I want to share.

Second factor is usually a shot wherein I strived very hard to make what I actually saw match what came out of the camera. The sense of acomplishment I feel makes it worth my posting, comments or no.

Third factor is an event or happening or place that I attended that I feel warants being shared just because it is interesting.  I can't count the number of other peoples photos that I've found fascinating because I've never had the chance to experience the place or event. Although through their posting I've at least gotten a chance to see it. So I guess with these shots I am paying it forward.

I guess I've never really thought about the why/what/when before but thanks to your excellent question I've puzzled it out.   : ) 

They say a picture is worth a thousand words...

So where do they go when a photograph leaves you speechless?