Everyone's showing GIFs, and some are also showing videos, works on paper, sound, and other cool related stuff. Together, their work shows the diversity of forms to be found in GIFs, and many of them comment on the broader social life of these image files.
Hence the Myspace page... GIFs grow, breed, and comingle sparklingly on Myspace.
Why GIFs? They're a relatively "open source" way to get ideas, in the form of moving images, out to broad audience. They are low or no cost to make, consume very little bandwidth, no one has to buy or download a proprietary player to play them. They have their own special charm, minimal in the way garage rock is minimal.