... you live IN San Francisco. I already have a lot on my plate, leaving me with little spare time. Unfortunately, okcupid doesn't have a "lives within 2 miles" option. So if you live farther away and message me, I won't reply. Also, this will tell me if you've actually read this, so if you specify that you do live in SF, you are more likely to get a response.

... you have a photo, and some information about yourself in your profile.