I, too, started out on the MSN boards. Whenever I was bored at work, I would spend some time on the MCC board over there. Since my board time was almost exclusively during working hours, I picked my screen name from there.
I've had this moniker since I signed up for an intranet account way back in early interweb days (anyone remember Prodigy?). It's my maiden name initials, what I collected at the time (not anymore) and the year I was born. I've always been JLBear71. I have a few other ones but this is the one I have always come back to.
Prodigy was my first also. I was sorry to see it disappear, even if my access was using a 300 baud modem over a phone line.
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The Principle of Least Interest: He who cares least about a relationship, controls it.