As more and more information is shared, copied and passed around in the internet, it's envitable that someone somewhere will use the internet as their personal tool for getting images for their own use.
Maybe it's in a presentation, maybe it's to print and decorate the wall. Or maybe it's for a promotional ad that will have your face featured throughout the country.
Web 101: Copyright, model release, and the Internet
What if it's used for some kind of female sexual dysfunction ad or male impotence drug ad?
Which is why it's really not advisable to post your children's photos on the internet. Especially on your blog with all the details about where you live, your lifestyle, etc. All the details needed for sickos to find your family.
Share, share and share but understand the risks.