An electrode system includes at least one electrically conductive element to effect at least one of delivery an electrical signal to living cells in the vicinity of the electrically conductive element or measurement of an electrical signal from living cells in the vicinity of the electrically conductive element. The sensors generate sensor signals that are responsive to at least two wavelengths of optical radiation after attenuation by pulsatile blood within the tissue sites. A first user input selects of one of the regions and in response to the first user input, displaying at least one object corresponding to a selected region in a portion of the selected region. The instant messaging engine may also transmit, using an instant messaging protocol, a response to the request, the response including the product data. The sites are classified as either legitimate or illegitimate based on a series of defined rules and analysis of parameters, such as site content, registrar identity, and owner.