If the colors are desaturated, especially the reds, and the contrast seems muted, then it's likely a color-space issue.
If you're outputting your image as AdobeRGB (common in PS or in-camera), which has a lot more "room" for reds as well as other colors, and it then gets uploaded to FB and they render it as sRGB (standard web colorspace) then the extra "room" in the reds will usually get added to where it shouldn't, and you end up with very flat red tones as well as other colors, and the contrast generally lowers as well a bit.
In general, whenever putting anything on the web, make sure it's in sRGB color-space. Anything else is asking for trouble on the web.
As an aside, I can't tell you how much of a problem we had with this at the photo lab I managed for 3 years. Customers simply didn't understand that we weren't a pro-lab, and our machines simply don't understand anything other than standard RGB (sRGB). Everything other than sRGB simply came out looking like garbage, much the way it looks when viewed over the web.
Don't feel bad if this is the problem, I've seen numerous photographers have this issue even with their online portfolios.
Dan O.
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