Forums with little or no drama (brick enthusiasts)
From Malaysia, the Official Bootleg Bricks thread,
https://forum.lowyat.net/topic/3401983
From Australia, the Cobi & Alternative Brick Sets thread,
http://forums.whirlpool.net.au/forum-replies.cfm?t=2350232
Also from Australia, the WP KO Bricks Wiki,
https://sites.google.com/site/wpkobrickswiki/
From Europe, the Eurobricks community,
http://www.eurobricks.com/forum/index.php?showtopic=94997
The Bloks Forum, set reviews
http://bloks.hyperboards.com/action/view_board/board_id/4/start/1
Here's a couple from Great Britain,
Lepin starts at page 278,
https://www.avforums.com/threads/lego-lepin-lego-the-everything-lego-related-thread.1948894/page-278
http://www.pistonheads.com/gassing/topic.asp?h=0&f=159&t=1615833
Forums with drama (Lego purists, resellers)
From the USA, the Brickpicker Community,
http://community.brickpicker.com/topic/2804-fake-non-lego-knockoff-and-counterfeit-sets-plus-reproduction-minifigures/
From England, the Brickset Forums,
http://bricksetforum.com/discussion/16099/lego-fight-against-chinese-counterfeit-lego
From Italy, the Italian Lego User group
Blogs
https://customizeminifiguresintelligence.wordpress.com
http://bootlegbricks.xyz
http://mybrickstore.blogspot.com
http://alternabricks.over-blog.com
http://downtheblocks.blogspot.com
http://brothers-brick.blogspot.com