This style of stamp (around 99x56px) was popularized on DeviantArt in the late 2000s and throughout the 2010s. Other styles, such as ones found on older Geocities sites, did exist, but didn't seem to have the same reach as these.
Popularized on Geocities and similar sites in the mid-to-late 2000s.
Popular throughout 2000s. Originally used as a way to link others' websites.
Originated on Wikipedia in the mid-2000s as informative notices on user pages.