mediaType 
  The mediaTypes this SOCommMediaClient should handle. This must be set, and can be set to either:
MediaType.Picture (meaning that only pictures will be handled)
MediaType.Video (meaning that only videos will be handled)
MediaType.Picture and MediaType.Video (meaning that both pictures and videos will be handled in one client)
Return
this to chain calls.
Parameters
mediaTypes 
The MediaTypes this SOCommMediaClient should handle.