If you post them online theres a good chance that someone might take them and use them. The best thing to do is to watermark them with your profile name.
Put a watermark on them
It doesn't have to be anything fancy, just clearly type your user name in the centre of the photo where it can't be cropped out.
"Put a watermark on them
It doesn't have to be anything fancy, just clearly type your user name in the centre of the photo where it can't be cropped out. "
This....