If you would like to disucss your wiki or some ele's wiki with you can go to the discussion tab above your page or their page to start discussing. Here is a great site to go to for some information about how to discuss a wiki. http://www.wikispaces.com/Features#tocfeatures11
If this site does not give you enough information then go the HELP button on your screen for additional information or more in depth info. on discussing within or about a wiki.