Now I'm really confused. I opened a pic in PS that had been shot in RAW on my D800 and manipulated in ACR and PS CC. Just now PS CS5.1 (on my work machine... CC is at home) I opened the JPEG file from that RAW that I had uploaded to Flickr.
When I clicked File/Save, there is a box in the bottom of the Save window that was checked, and it said "ICC Color Profile: Adobe RGB (1998)." So this time I unclicked that box and saved the file under a different name, assuming it would now be sRGB and therefore possibly more vibrant in a browser. The new file, however, is MUCH duller than the original.
Also, I checked the PS Edit/Color Settings, and the working space is set to sRGB, but the RGB "Color Management Profile" is set to Preserve Embedded Profiles. So I guess that's why the Save File box was checked for Adobe RGB.
Up until a few weeks ago, I had been shooting in AdobeRGB but never checked my output profiles from PS. Maybe this is a good weekend to do a bunch of tests.