Update: I have now stripped out any possible connotation of soliciting links, in an (over?) abundance of caution. Instead of “Donate by Linking,” the page is now just “Linking Information” and provides only factual information about what constitutes a correct and relevant link to PainScience.com. I believe the original page encouraged only sincere, natural linking well within the spirit of Google’s rules, but with these changes I hope there’s no longer any possibility of misinterpretation.