Ann, you can share photos, but I wouldn't share from my Dropbox account as it contains other files. Documents etc.
I always think that if you give someone a link to online data storage, it can be an opening for them to find more things. I use Photobucket, which, after using many other sites over the last 10 years I think is the best. It only has photos that I share, anyway and I am not bothered who looks at the files.
You can't share files on Dropbox as easy as you can from Photobucket.
I see that Rachel doesn't like Photobucket, but its horses for courses, and the best software or website is the one that you are used to.