I don't know whether or not it's had more public exposure, but I don't think it's had longer public exposure. Afaik, bcrypt's canonical reference document is the June 1999 Usenix paper (http://static.usenix.org/event/usenix99/provos/provos_html/i...), while PBKDF2's is the September 2000 RFC (http://www.ietf.org/rfc/rfc2898.txt).
I don't know whether or not it's had more public exposure, but I don't think it's had longer public exposure. Afaik, bcrypt's canonical reference document is the June 1999 Usenix paper (http://static.usenix.org/event/usenix99/provos/provos_html/i...), while PBKDF2's is the September 2000 RFC (http://www.ietf.org/rfc/rfc2898.txt).