in reply to
Learning by doing.
Browse SoPW for questions that you think you can answer and write the code - even if you don't post it. You can use other answers as a crib. Do the same sort of thing with Cool Uses for Perl.
The same name on every site (unless it is taken already)
A different name for every site
The same name for sites I don't care about, but different names on sites I do care about
Different names for sites I don't care about, but the same name on sites I do care about
The anonymous account
Someone else's username
Root, after hacking into the site
Results (220 votes),