A company called Zopa.com just created a tool that looks at your tweets for the year to figure out if you were "naughty" or "nice." You just enter your Twitter name, and it analyzes everything you wrote to figure out which list you belong on.
And to answer the most obvious question . . . Twitter's most prominent user, President Trump, scored 78% naughty.
You can check out the tool by Googling "zopa naughty nice."