If one wants to remain private, and be anonymous, one should not post his name on a political web site, or any site for that matter. The results of that should now be obvious. Also, one should never list his telephone number, unless they don't mind surprises. However, without elaborating, I must tell you, even if he didn't post his name, and had an unlisted telephone number, he could most likely still be found, if someone really wanted the info. Yes, it would be more difficult, but could be done.
That's going too far. People should be careful though, it's easier than they think.
Odd that the LATimes said they found him by looking at posts from "the last two years" specifically.
I don't think they did. I found it by looking at much older posts.