If you want some insight in to what good parenting looks like in the 21st century, read one mom's blog on her kids' behalf.

A mother-of-four from Austin, Texas wrote a hilarious open letter to her son's female Facebook friends, warning them they will be blocked if they post sexual selfies.

The woman wrote the post entitled, 'FYI (If You're a Teenage Girl)', on her blog.

She wrote about girls taking a bunch of selfies in their pajamas this summer, and she asked why they are striking red-carpet poses before going to bed.

The mom added that she regularly checks her sons' social media pages with them and, if she finds sexy gal poses, friends will be blocked.... because she cares about what the boys see.

Here's a link to see Mom's open letter to the girls...