If you loved a book or series and don't know what to read next...
Browse it all or choose the "Young Adult Literature" search filter to limit to YA books.
Closet Club, Graphic Fantastic, Nail Biters, Riot Grrl!, Spectacular Speculative Fiction, and Teen Tearjerkers are just a few of the lists you'll find here.
End-of-the-year book lists, roundtable discussions, and ways to get involved.
(YALSA = Young Adult Library Services Association)
A sample of the lists here: Dragons, Feminist Books, Fight the (Abuse of) Power, Mental Illness, Suicide, Teen Pregnancy, and Time Travel.