If it's "who did I meet first?", it's jim_p, who I met when I was 13 and once again at (I think) 18, but then forgot he existed until I met him again over a decade later. As for who I've known the longest continuously, it's docwatson42, who I met in my junior year in high school. (kalessin remembers me from the same timeframe, but not I him.)