I was just asked if it was possible to share images and other files via private messages. Unfortunately not.
I added a bit more information in the "technical help" wiki page:
I hope that members who know specific ways to safely (and privately) share files using third-party web sites will chip in and update directly the above wiki page.
Generally speaking, the whole wiki section has been created for your convenience and to allow the whole Reuniting community to work together to create the best reference on all the topics regularly discussed in the blogs and forums.
Unfortunately, the logs indicate that to a very large extent, the only regular contributor to the wiki is Marnia herself, as if she were not already busy enough contributing in so many other ways.
Making a good use of the wiki and improving it is one of the many ways you can help and show your gratitude for all that this site is giving you.