Dude, internet anonymity. Learn about it. Download Tor, or Hotspot shield, they're programs that will mask your actual IP address and makes it damn near impossible to find you. Personally when ever I post anything of a questionable nature (not that I would ever do such a thing), it's from an account that's attached to an email under a false name with a different username than I use on any other website, and a different password from anything I've ever used so that even if somehow the account was linked to my IP I have deniability of saying that I use the same email and password for all of my other accounts for every other forum I use (except for sensitive information like paypal and that stuff, that's all well secured and each of my bank accounts and other financial accounts have their own unique passwords and account information each linked to a separate email.) you should also look into cookie cleaners. Every time you go to a website you get cookies saved to your computer to make the website load faster on repeat visits. I scrub my cookies every time I close firefox, and even if I dont close firefox there's an automatic scrub that occurs every 30 minutes. Any time I'm accessing sensitive or questionable material on the internet im behind 4 or 5 proxies minimum, so even if they manage to find out that my computer wasn't really in Bangkok, china, it would give them the IP of some random computer in india, and that IP would lead them to denmark or some other random country. It would literally take thousands of supercomputers years and years to discover my actual location when I'm behind proxies, and even then, I have deniability still. I have any sensitive information stored in a 256 bit encrypted container, and inside of that container is a second encrypted container, and so on.
If I should ever engage in anything illicit online (not saying I do) or to post anything incriminating online (again, something I never do) they'd be able to power half of the earth's energy usage by hooking up a generator to my body 6 feet under, perpetually spinning from laughing so hard at their efforts to link any digital information to me.
Also, each of my encrypted containers has a 30 character password including lowercase uppercase, numbers, symbols and alt-codes, and are limited to 10 attempts to open the container. After 10 attempts the container automatically erases its contents. If any sort of subpoena were ever raised on my computer, I'm only required to offer up the password for the container on the desktop. The other containers are hidden with other files, and unless I admit they're there (durrr not happening) I have no legal obligation to provide passwords for any subsequent containers, so even if those are found, its GG when they auto erase.
***Everything in this post is purely hypothetical, I never engage in any activity that would warrant such careful procedures to protect. Again, this entire post is purely hypothetical.***