Adds a chat item to the chat section of the site. If no datestamp is given one is generated for you.
Location: http://hackdaylondon07.backnetwork.com/api/1.0/addChat.aspx
apikeystringrequired
personidintrequired
messagestringrequired
datestampISO date
externalsourcestring
externalusernamestring
externalidint