I decided to move this post from the tread about Russian board moderation into separate tread.
Yes, I read sticked posts very carefully. Unfortunately, even the best of them, Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ doesn't explain everything.
The most important part for me is about referral links because 3 of my posts have been deleted because of that.
"4. No referral code (ref link) spam" is all I could find about that in all three sticked posts. But what does that mean?
1. That using of ref links in posts is totally forbidden? But I see treads like this that contains 50+ ref links and still is active from Sep 2014. And this tread is not alone.
2. Many people including forum staff and users from default trust list used ref links in their signature. Does that mean that signature is exceptional place where ref links are allowed?
Where can I read about this exception?
Where can I read about all possible exceptions?
3. Many people post links not to faucets itself but to faucets rotators or their personal web page with faucets list.
Formally these links are not referral. Really they lead to a bunch of referral links.
Is that allowed?
4. Some sites use invite codes instead of referral links.
Like "please, check genesis-mining.com" and use invite code ***** to get 2.5% of discount.
Are such posts allowed?
5. When I write review of some bitcoin service can I add at the end of post
"If you find this review useful, you are welcome to use my referral link (LINK) or you can use this non-referral link (LINK)" Can I?
6. Can I ask people to PM me if they want to use my ref link?
Do all moderators know all these nuances?
I don't want to break forum tules. I just want to know what I can and what I can't do.
Haven't you checked the sticky? It explains fully. 
Yes, I read sticked posts very carefully. Unfortunately, even the best of them, Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ doesn't explain everything.
The most important part for me is about referral links because 3 of my posts have been deleted because of that.
"4. No referral code (ref link) spam" is all I could find about that in all three sticked posts. But what does that mean?
1. That using of ref links in posts is totally forbidden? But I see treads like this that contains 50+ ref links and still is active from Sep 2014. And this tread is not alone.
2. Many people including forum staff and users from default trust list used ref links in their signature. Does that mean that signature is exceptional place where ref links are allowed?
Where can I read about this exception?
Where can I read about all possible exceptions?
3. Many people post links not to faucets itself but to faucets rotators or their personal web page with faucets list.
Formally these links are not referral. Really they lead to a bunch of referral links.
Is that allowed?
4. Some sites use invite codes instead of referral links.
Like "please, check genesis-mining.com" and use invite code ***** to get 2.5% of discount.
Are such posts allowed?
5. When I write review of some bitcoin service can I add at the end of post
"If you find this review useful, you are welcome to use my referral link (LINK) or you can use this non-referral link (LINK)" Can I?
6. Can I ask people to PM me if they want to use my ref link?
Do all moderators know all these nuances?
I don't want to break forum tules. I just want to know what I can and what I can't do.