code: public void setProperty(String key, String value) {
  		if(properties == null) {
  			properties = createProperties();
  		}
  		
  		if(value != null) {
  			value = value.trim();
  			properties.put(key, value);
  		}
  		else {
  			properties.remove(key);
  		}
  	}
docs: Sets a custom property.  This will override settings in socialize.properties.
  @param key
  @param value