Maybe the question is like "what is a woman?" in that it requires self-identification. You know? You are in love if you identify as being in love. That word identify means that, in addition to any externally verifiable attributes, you have an internal sense that you are in love, you believe your sense is true and accurate, and you can argue in support of it.
Hmph. There was my random Soniaesque reaction. Now that I read what I just wrote, I'm not sure it says anything. :cleansing breath: Moving on, let me try that question in the the subject line.
Not if here means specifically crossdressers.com, but if here means the internet in general, then...once. It was wild and wonderful and it didn't last. The problem was that I wasn't ready for love. I hadn't peeled back enough layers, didn't know myself well enough. What does this have to do with the internet? Nothing. I failed at love, never mind that it was internet love.
I'll add one little thing that did seem internet specific . The two of us both felt that falling in love this way was particularly mm--authentic because we were shielded from the distractions of the physical. We always said we fell in love with each other's minds first, and bodies later. (We did eventually get together in real life.)