Auto correct should more properly be called "auto dog's breakfast'.
It might do a tolerable job with a holiday snap or a landscape (I've not checked) but using it on most model photos is more likely to ruin them than improve them IMHO.
My personal rule of thumb for Caucasian skin tones when retouching for web viewing is not to push any channel above about 240 if I can help it as lots of cheap monitors and laptop screens start to blow out highlights to white above that.
Other than that, assuming you have a properly calibrated monitor, do what your eye tells you is most pleasing.
Just my $0.02