If you ever need to do this, the short way is to go to http://toolsgeek.com/upsidedown.php, type, copy and paste the text anywhere else.
For a detailed explanation of how this work, visit:
http://www.howtogeek.com/howto/30197/ask-how-to-geek-how-do-you-make-upside-down-text/
This works perfectly on Facebook and Twitter (including their mobile apps) but will not work on all websites, especially if you’re using an admin to manage them (including WordPress).