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You can earn activity points by filling your profile with information about yourself (what city you live in, your favorite team, blogs etc.)
There are many self publishing websites, it need not cost much at all. And there are publsihers which allow low print runs of books, so again a minimal cost.
I would suggest letting a legal bod run their eyes over the finished product priot to publication, otherwise you might end up in a spot of bother.
I always thought a web blog would work,hosted in some obscure place, and run anonymously.