I signed in once and then had to change email addresses. I was firstname.lastname@example.org if any of that information can be transferred. I also registered a book under that address and the screen name "straw".
But that said, I'm an avid reader who has run out of shelf space and find this a great idea for that reason and for just the fun of sharing what I have enjoyed with others. I have shared your web site with friends and especially plan to do so with my book club members when we meet again.