preamble:- This is not related to my 1-year suspension which just expired, I understand the reasons for that, because my comments were really spam (because I posted links to PO threads before they were answered there. Note that I'm also not asking for the reasons for any suspension, but rather asking for some clarification regarding a policy that doesn't seem clear to me.
The user Dilaton was suspended for posting links to PhysicsOverflow threads that answers questions posted here on Physics.SE. Dilaton took explicit care to only post links to answers on PO which already had a positive number of upvotes, learning from my experience (because the moderator who had banned me had stated that it's OK to link to already-answered questions on PO).
I am completely sure that this is the precise reason for his/her suspension, because I know from communication with him/her, the precise warnings that Dilaton received and the correspondence that went through. A moderator also tried to get some community support (although he failed to do so) for this decision beforehand by asking people in the hbar for their opinions. Furthermore, another moderator even created a script to delete all mentions of PhysicsOverflow.
Is it not acceptable to post links in comments? Or is it not acceptable to post links to the same site in comments? Would it be OK if I, say posted links to answers on PO, but also to some on Quora, Wikipedia, etc. which SE considers uncontroversial? Would this also result in a suspension?
Also, is there a list/blacklist of such "controversial" sites?
edit after Kyle Kanos's clarifications:- It seems that the policy is that no links to other Q&A sites is allowed. This is a bizarre policy to say the least, but I will take it to be policy, since no moderator has corrected him. So I ask:
- Where is this policy documented? Where can I read the details of the policy? Specifically, I'm interested why comments (often posted by moderators here) like "Cross-posted to PhysicsForums" are allowed, even without the guarantee of any useful additional information being present on the linked site (showing a sharp contrast with the links to PhysicsOverflow threads, which already contain direct answers to the question).
- Has this policy been implemented in the past? For example, if Anton Geraschenko had linked to a post on MathOverflow that answers the OP's question, would he also have faced a suspension?
- What if I leave some other comments, too? Would the links to PO then still be considered spam?
Also, I'd like to clarify, that the issue is absolutely not "advertisements of other Q&A sites" - rather, it's about posting links to direct answers to a particular question asked here. It's not too different from posting links to a wikipedia article that answers the question.
It simply isn't advertising - I know the statistics of how useful the comments are for PO, and it's hardly noticeable. It would be pretty silly of me to post such comments to advertise PO, when it achieves little or nothing for PO (but it helps the OP), don't you think?