No offense to people that use this "technique" but it looks terrible. I'm assuming people are trying to copy the "PLAYBOY" or "Maxim" look...this is not it the way to do it. Adding glow does not help either. Although on small web sized photos it's not as obvious, this "technique" never works on high resolution / printable images. Do not do this to any photo you want taken seriously.
There are some funny sites that poke fun at this type of stuff. This is my favorite: http://photoshopdisasters.blogspot.com
Be nice to your photos. Hire a professional.