What do the major forums refer to? I often see some promotional posts referring to "major forums". What do the major forums mean?

1 Netease community 2 Sina theme community 3 verycd forum 4 Tom community 5 Sohu community 6 2 1CN community 7 Tianya community 8 China net forum 9 powerful forum 10 Xici1/westland forum set 12 China People's Forum 6543. 8+03 Cat's Eye Watching People/KOOC-0/4 Shuimu Tsinghua BBS/KOOC-0/5 Blog Forum/KOOC-0/6 Qianlong Community/KOOC-0/7 China Military Forum/KOOC-0/8 Shanghai Hotline BBS/KOOC-0/9/KOOC-0/765438 Game Forum 20 Puff Community. 22 Oriental Forum 23 Dangxiu Forum 24 QQ Forum 25 Donews-IT Writing Community 26 Baidu Post Bar 27 CCTV-BBS 28 Youth Forum 29 China First Forum 30 Huasheng Online 3 1 Southern Community 32 Phoenix Net Forum 33 Tianji Net Forum 34 CCID IT Community 35 Film and Television Empire Forum 36 Win the World Forum 37 Ninth City 38 Hongyi Fast Green 39 Meiya BBS Forum 40 China Webmaster Forum 4 1 Lianzhong Game Forum 42 sogou Entertainment Forum 43 Forum 44 Vertical and Horizontal Finance 45 Ocean Forum 46 Real Community 47 263 Xinhaiyuntian 48 Spring and Autumn Warring States Period 49 West Lake Forum 50 Qilu Hotline Virtual Community ... ranked in no particular order.

Hope to adopt