A few months ago, I stumbled upon a post where people were complaining about Goodreads. I have to admit, I was rather surprised since so many fellow reader and author use it, and for me it appeared to be perfect. It really has everything I need, rating, reviews, shelves, groups, lists and so on. I did try both Shelfari and Booklikes, but I always returned to Goodreads. Later on I read about an occasion when reviews got removed, but it didn't affect me and to be honest, I didn't care about it much.
Then I few weeks ago, I received an email from Amazon which I was invited to join Shelfari in and being keen on trying out different programs, I re-considered my choice of bookish social site along with a not so short research.