Nancy,
sRGB color mode is web color mode.
For best image preview on web site you must use sRGB color profile or Adobe RGB color mode .
Please note for Adobe RGB color profile some web sites have Imagemagick script where automatically convert Adobe RGB color mode to sRGB color mode for better image preview on web site ( FAA is one of these sites ), but some web sites don't run Imagemagick script .
For any case try always to upload images to web sites in sRGB color mode.
Later POD services print file in sRGB, Adobe or CMYK color mode, they convert color modes if is necessary for printing.
So for you is the best to always upload files on web sites with embedded sRGB color profile, only on that way you will be sure that your images won't have color cast on web or over saturated colors.
Best
Milan