Questions & Answers:

Abridgements used:
SbE - Standard British English
SaE - Standard American English

Credits:
Article - Me. I spent my time writing this article, so please, if you use that on your website or whatever, don't forget to provide the link to the source. Or credit me.
Pronunciation used - My voice
Definitons - Oxford English Dictionary, me myself.

THAN/THEN Differences. It's by far the most common mistake that is known to me. Basically it happens just because than sounds exactly as is then on American English.
Now explaining both terms:
than: introducing the second element in a comparison...

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THIS IS VERY URGENT AND NOT A JOKE! ALSO DON'T GOOF OFF!!!!

I really mean it! What would you be able to do if SOPA/TPP censors the internet? What would you be able to do if writing fanfics and drawing fanarts become illegal? What would you do if it's illegal to do a cover of your favorite song on YouTube? What would you do if downloading things from the internet (music, movies, TV episodes, etc) became illegal? What would you do if SOPA/TPP wins the war and takes away internet freedom? Net Neutrality is already dead so far, we can't risk the freedom of internet...