They load your current identity information allowed for the site they are displayed on.
Badges are the same size as regular gif/png badges -- but clicking them pulls in your identity content. When users click a link, FindMeOn.com tracks the click to measure how people jump between your various identities.
Cross site link information is available in many formats: We offer several flash badges that work on most social networks. For social networks that prohibit or cripple flash badges, we offer a 'dynamic gif'. We also have static gifs and can provide you with the information as simple text via our API.