Maybe I'm mixing something up, but I thought that you need to categorize your images at pond5 (I submit to lots of websites).
I believe to remember that I had to categorize my images, but I can't find that field during submission. I keep lists of all categories for each website locally on my PC so I wonder whenever I wrongly renamed my list as "pond5". I used those lists with a tool I have written for myself and I don't want to keep categorizing if I don't need to.

Here is the list:
"abstract",   "aerials",   "alpha channel / greenscreen",   "archival",   "animation",  "animals / wildlife",   "backgrounds",   "buildings and monuments",   "business / commerce",   "celebrities / paparrazi",   "church and ministry",   "crowds",   "clouds",   "concepts",   "elements and effects",   "explosions",   "fire",   "food and drink",   "globes",   "health and beauty",   "holidays / celebrations",   "industry",   "lifestyle / people",   "lower thirds",   "loops / vj",   "medicine",   "military",   "music related",   "nature scenics",   "news / documentary",   "politics",   "retro",   "science",   "slow motion",   "sports",   "stereoscopic 3d",   "technology",   "textures",   "timelapse",   "transportation",   "travel",   "underwater",   "cities / urban scenics",   "verticals",   "virtual sets",   "transitions and wipes",   "weddings"

Is or was this Pond5? Any idea which other website this could be? Can I throw that away? Google search wasn't very helpful.

Those categories are for video.

I don't think they have categories for photos.

Yay!!

I wish Fotolia and Istock did the same Categories are plain horrible there.