I found this from +Evo Terra, who you should be following, especially if you're an author.

It turns out that what I mostly talk about on G+ is... you. Huh. Weird.

Make your own here: http://timc.idv.tw/wordcloud/en/# (But, as Evo says, make sure you select posts and not profile. I also suggest that you go into your account and revoke access as soon as you're done.)
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