I'm not sure what this means. I would think that the spirit recently expressed by NASA and posted by Astronuc: would generally apply in any truly scientific endeavor. I regularly post links to Physics Forums on other forums, and this information is then more broadly spread about. In fact, such a crosslink was posted just yesterday by a British friend who learned of these boards from me, a few months ago. She posted the link on the BBC science boards: http://www.bbc.co.uk/dna/mbsn/F2801717?thread=2627921 If the policy is to not share these links in both directions, freely, then I'd like to be clear on that. Naturally, if the spirit of free exchange of scientific information is not present on this science MB, I would stop advertising PF on other boards. I'm curious for general thoughts on this. Perhaps this is better dealt with by PM? I'm happy to PM the relevant mentors, to discuss this. Please advise.