You guys are helpful.
Tell the curious girl that she should go for it, that the worst that can happen is that the out girl will say no... that way, you don't violate any trust, yet already know that in all likelihood, nothing bad will come of things.
Yeah, that's what I'm thinking. I can put the ball in her court and if she doesn't act on it, I guess that's her problem. I can't do everything.
If you're going to nudge things, suggest that Out Girl cultivate a face-to-face, non-romatic relationship with Curious Girl, then let the dynamics between the two take the situation where it wants to go.
Another way you can do this is to send a PM to the both of them at once stating something to the effect of:
The two of you have entrusted me with confidential information. You might benefit by sharing this information with each other.
Otherwise just sit on this information.

Sneaky!! Tempting, I just hope it wouldn't backfire.
Invite them both over to your place, get them drunk, play some Ani Difranco lesbian music and leave the room.
Yeah, if they lived near me, that would be a possibility. I could ask them individually to come over and not let them know who else would be there, and then let nature take its course.
My thoughts are a cross between MLB and LOB's posts. Either encourage the girl who isn't out to take a chance (never the other way around, that would be violating her trust by suggesting to other people that she might be bisexual/gay) or simply leave it be (odds are it'll be far more trouble than it's worth and there's never any guarantee of a happy ending - especially considering the distances apart).
Yeah, I know there's no guarantee of a happy ending, I just happen to think they would be good for each other if they got past the things standing in their way.
Hook up with both of them... at the same time. Then post pictures.
But in all seriousness, no harm in telling one of them. No one is ever upset to hear somebody likes them.
I'm more concerned with how the "curious girl" would react if I told anyone else. Again, it's not public knowledge, and she's really paranoid about anyone else finding out. I think she very much needs to explore who she is and might need a little prodding to really do it.
Is one of the girls called "Batgirl"?
I don't understand the reference, but I assume that was a joke.
You mentioned they live a hundred miles apart...but do they live near you? You can invite them over to someplace in between, if indeed there is anything in between to do. Once they get together and all three of you have a few drinks to loosen yourselves up, perhaps you will end up like Burt Reynolds' character in "Boogie Nights", sitting off to the side while Rollergirl goes to town on the fresh meat.
Be sure to have set up a few hidden cameras in the interim. This will be gold, and in your later years you will regret that you didn't immortalize this on video when you had the opportunity.
In all seriousness, however, I believe the first approach is the sensible one. Message them individually, saying you believe they may both benefit by talking to each other. The "out" one will appreciate you looking out for her, and the worst that the "not-so-out" one will think is, "She's not my type"...but she will still appreciate your discretion.
Who knows?...they might be so grateful for your discretion that they invite you to be the filling in their sandwich...
It does seem like it would be easier to move things along if they lived near me, and I could do it more subtly. When all I've got to work with are words on a screen, it's not easy to get the point across without being blunt.
Yeah I'd go with the "nudge them along without breaking their trust" approach.
Personally though I'd rather be told that the person I was intrested in was intrested in me in return, even if that meant breaking a bit of trust. But then again I am terrible at reading signals and has had quite the poor love life.
I think I'll hint to the curious girl that the other girl has spoken about her favorably and then give her a nudge in that direction. That's probably the least risky way to go about it. I haven't seen any better suggestions so far, other than the ones that aren't possible.
