...this confuses me. So...it's like tumblr...for books?
Either way, I'm mainly on Goodreads. I do occasionally come here, and also do periodically import my shelves from GR here, but GR is a more sure bet for contacting me.
It's more romancey than steampunk-y. You get a nice bit of steampunk wingporn, though (not exactly, but it just sounds amusing to call it that).