Questions & Answers:

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

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

THAN/THEN Differences. It's 의해 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 초 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 당신 be able to do if SOPA/TPP censors the internet? What would 당신 be able to do if 글쓰기 fanfics and drawing fanarts become illegal? What would 당신 do if it's illegal to do a cover of your 가장 좋아하는 song on YouTube? What would 당신 do if downloading things from the internet (music, movies, TV episodes, etc) became illegal? What would 당신 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...