As a lifelong geek girl, I’m reveling in the existence of these amazing sites. For one thing, they validate who I am and the genre entertainment I love. (Validation that’s not always easy to come by in fandom, I might add.) They also offer female-oriented geek content that I didn’t realize was lacking until they started publishing it.
It almost goes without saying that geek girls are an under-served and untapped market, not just for science fiction romance, but for all kinds of SF/F entertainment. Geek girl sites are one way to to help correct that imbalance. I sense exciting changes in fandom just around the corner!