it turned out to be:
1) 不學王明 is BILLINMON's ma ja, no wonder his english is so good. he likes chasing ...
2) 十裏紅妝 is LILAC's ma ja, no wonder she like following Billinmon's posts.
3) haha, 忘俠 is Eagle's ma ja.
4) Good catch: 婉蕠, 紫君, 斕婷 are 林貝卡's ma ja.
5) it seems to that STAR/CARPE/BILLNET are not related.
6) i guess that SELF^3/馬奎/灰衣人 are related:)