I've come over from vB and have set my forum up so guests can not see attachments in the hope it will motivate guests to join and be an active part of the community. I've had a sitemap on vB and I now have one on my converted vb to XF forum and I've noticed that google is complaining about attachments not being viewable, mainly image files. It never did this on vb so I'm guessing xF handles it differently. So my question is what would you do? deny access to attachments folder via robots.txt? allow attachments to public? or an alternative?