The third question is the ever-popular "Why Tiger Spot?"
Long, long, ago, when the internet was new and kids were instructed never ever to give out their real names online, my parents signed us up for AOL and I picked that for my screen name. Just Tiger didn't seem long enough, so I added the Spot to distinguish myself. There wasn't a whole lot of meaning at that time, but it grew on me (I used it for my superhero alter ego and everything) and I discovered that it was never taken anywhere, so it made an excellent consistent identity. I am strongly in favor of consistent identities, so that people who know me in one place can recognize me elsewhere, and so that I don't have to remember a whole lot of different names (I have enough trouble keeping other people with multiple names straight; I don't need to add myself to the problem!).
People object to it sometimes on the grounds that tigers don't have spots, but in fact normal tigers have two spots, one on the back of each ear. One of these days I will get around to finding a good photo to turn into a user icon.