Thanks for replying. Does that mean that there's a good chance that the users on the profiles I'm viewing are from another nation, even though they claim to be from the USA? I know there's a lot of fake profiles on this site.
It could be, but it could also just be funky little characters used to augment certain sentences or names. If you have played on steam at all, and see all of those usernames that appear like warped letters, that is unicode as well.
If your really worried about it, you could try to switch your website to pure ascii (or at least the part where users input text), but as with any change, it could take time and cause unexpected problems.