The invention relates to a bipolar plate for a fuel cell stack, which comprises at least a an anode-side sub-plate. In one example, a web site such as a social networking site or photo-sharing site allows users to upload photos, and allows faces that appear in the photo to be tagged with users’ names. The lobes abut at least 60% of the circumference of the smallest circle that circumscribes the element and the channels form openings that abut no more than 40% of the circumference.