As Olda-G said, sRGB is the standard for monitor display and it's generally what the defaults are for when manufacturing monitors. They may be poorly calibrated, but if you use sRGB it's your best bet at getting it to look right on random computer monitors.
AdobeRGB and some of the others are typically aimed at printing or other use.
But yeah, you should generally use either sRGB or AdobeRGB for best results depending upon your expected output medium.
Fuzzypiggy is steering you in the right direction. If you are using photoshop use edit->convert to profile->sRGB. This will convert your color space and preserve EXIF data (which I prefer). If you are using Lightroom adjust your export settings to do the same thing. You want to avoid editing in jpeg but converting to high quality jpeg (I usually go for maximum) as the final step is the right way to go. Deviant Art assumes everything is submitted is sRGB and any other color space will look odd.
Mercury-CroweFeatured By OwnerJan 18, 2013Professional Artisan Crafter
You're saving them in the wrong format.
Try 'save for web' in photoshop, or maybe .png format in other programs.
Web display has way less colors than your camera or graphics program can handle, so it's simplified down. Just saving as a jpg gives it even less colors to work with, and it sort of goes for the closest match on the colors it has access to- which doesn't always look like the 'right' color.
PNG is a little better about those colors, and save for web is intelligent and chooses the one that LOOKS closest as opposed to actually IS closest, so it looks more correct.
Hmmm... all i know is when i post it as save for web ore png i do see the colours brighter but the quality of the pixel and focus is less somehow what kinda brings the quality of photo down what is kinda disappointing....