See my post above.
If your city of origin changes every few hours, and you can change your name as often as you want (even post to post)------- Isn't that enough anonymity ?
Topix still will have your ISP.
If you want something more nefarious, such as what you see on TV with the bad guy's ISP's bouncing from country to country, well,--------- give the NSA a call.
I'm pretty sure that they'll send you a copy of their program.