The best way to get in touch with USFirstGirls is by email: firstname.lastname@example.org. We check the account daily, so you can usually expect a response within 24 hours.
If you are experiencing issues with the site, try eric+USFG@eric-stern.com. Again, you can expect a response within a day - usually faster.
We also regularly browse the forums, and will respond to any questions we see.