Lisa wrote

The directors have discussed the situation where there are several posters that have made massive signature lines, incorporating multiple large images.  

We don't want to get into a situation where the signature lines are longer than the posts that people are making, so we have discussed some guidelines that we would like to implement to keep this under control.  

The images used in a posters signature line should not exceed 480x60 pix total. For example, a poster could have one 480x60 pix image, or two 240x60pix images or four 120x60pix images in their sig-line (you get the idea?).  

Also, they should not have long lists of things in their sig-lines.