Here in Ashland, Oregon is the festival of lights. I’m not going, but I can’t help but think that if I was I’d be taking lots of pictures. I also can’t help but think that someday I might take up photography (with a real camera and lens). If I do, I’ll be out there at public events taking pictures of people for free.
I’d then hand anyone I took a picture of my business card directing them to my Facebook Page, where they’d have to Like my page in order to see their picture (you can easily do this using a free app called Shortstack). They can then see your photos in your gallery. They can download it, share it with their other friends on FB, and comment on it.
I’d take it even further and give them a link to my website where they could download the high quality photo for free (since FB compresses images).
Sure, there are a handful of reasons not to do this, but the reasons to do it outweigh them significantly.