Turns out that in late August 2008, when I flew east and, among other highlights, visited my friends rafaela and slipjig in upstate New York and traveled with them to Burlington, VT, I just — just — missed being in the same place at the same time as bonnie_rocks, who I'd meet online two years later. She and her fiancé were visiting upstate New York and Burlington that month, too.
Bonnie told me this today. I replied, "What if we'd run into each other? 'Hello, future friend!'"