code: public void addSite(String siteKey) {
  		ValueMap gv = new ValueMap(siteKey);
  		if (!this.valueMaps.contains(gv)) {
  			this.valueMaps.add(gv);
  		}
  	}
docs: Registers a new site for specific data collection. If null is used as a
  site key, then all data is collected.
  
  @param siteKey
  the site to collect geo data for