A forum site dedicated to weightlifting. The main Olympic Weightlifting forum is pretty active and has some high-quality contributors. http://wlforums.com/forums/forum.php
https://mastersweightlifting.org/ The organising body for masters weightlifting in the USA
http://www.sportivnypress.com This website, run by Bud Charniga, has a lot of interesting weightlifting content, including translations of classic Russian information and historical information. Several translated Russian books are available from their store.
This amazing site, maintained by Arthur Chidlovski, is a treasure trove of information about weightlifting. It features competition results, records and stories about the lives of weightlifters going back decades. It also includes some fantastic photographs. http://www.chidlovski.net/liftup/