I originally sent an email to GC.com about this, but they have advised posting it here. I am not sure why, but I suppose it is so that others can weigh in and they see the general opinion.
We are a local geocaching group based in the East Midlands called EMcache. We have had an online forum, but recently moved onto a Facebook Group, which has meant we don't have to pay for hosting and those without technical ability are able to administer it much more easily. We did not thing this was unreasonable because it is free to sign up to Facebook.
This only became a problem when we published our Christmas Event and asked people to go to the Facebook group, giving a link, to vote in our annual Geocaching Awards, the EMmys. The reviewer did not allow the listing with the Facebook group link, even though we had basically copied an pasted the cache description from last year, where we had linked to our other web forum. Further questions and discussion showed that the reviewer was following guidelines, and since Facebook is considered to be a commercial enterprise it cannot be advertised in cache descriptions.
This seem unreasonable to me. Firstly, you can sigh in to GC.com with a facebook account and publish your finds on Facebook so there is clearly already a relationship between the two. Secondly, it is not the website we wish to advertise, it is our geocaching group, so that other can come and join us, rather than us being an exclusive group to those who already know about it.
Someone suggested that it may be because we are a closed group. This is necessary only so that we can monitor the suitability of the posting, which has have had problems with in the past, and prevent abusive or illegal comments being widespread. The admins (not me) are very quick to accept individual's requests to join.
What do others think? Should the guidelines be changed to allow geocaching related groups to be linked to in cache descriptions?