I have been uploading pics to my PC, when I post these pics, (from my pc), they all look proper untill they get posted, then some of them are rotated. And it's not the ones that I took in Landscape, just randomly rotated portrait pics?iPhone? If you use an iPhone (or smart phone), make sure you hold the phone sideways with the home button under your right thumb.
If you snap the picture in "portrait mode" (see above), then we see it sideways because it gets rotated to landscape mode.
Your phone always auto-rotates to the orientation you took the photo, but the computer doesn't know which way is up. Lesson, when posting pics to the internet, always shoot the picture in landscape mode with the button to the right. Hope that makes sense.