Hi Nic,
Unfortunately I have no experience with photo sharing sites. I think it is a marvelous idea. I know Anne also has a few very old photographs of your Gran and Grandad as well as your Great Grandparents. I am sure the family would like to take a look at these as well.
I will chat to her and we can post them on the blog. In fact I am wondering if it might be better to rather email them to you and you can consolidate the posting? Please let me know what you think.
Graham