Question

Why do some people put two spaces after a period? It is an incorrect practice!

Answer 1

heavy fingers?

Answer 2

Agreed... Sometimes people just don't care or they have heavy fingers like lgba says(:

Answer 3

Hmm, but seriously, people should not put two spaces after a period.

Answer 4

yes. Only one space after a punctuation mark.

Answer 5

Also, people should not put a space before a punctuation mark. For example: "Hey !! How are you ??"

Answer 6

Because they think it's "cool" to type like that.
They also think it's cool to type words with an s at the end (For example: "word's") with an 's instead of just an s.

Answer 7

Uhh... It is not "proper" but it is a commonly accepted practice and often considered the norm.
http://www.mla.org/style/style_faq/mlastyle_spaces