It gets formatted as a stronger/more obvious block of text (with the watermarked quotation mark, apparently) and a smaller attribution line, without the poster having to format anything themselves.
Depending on people's layouts, I've seen this show up in slightly different styles, too - like with the quote text in red, or something.
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Aha, and usefully, the very first post I saw on my dash when I went to look for an example was a quote!
http://dduane.tumblr.com/post/23681300169/she-was-beautiful-but-she-was-beautiful-in-the
It gets formatted as a stronger/more obvious block of text (with the watermarked quotation mark, apparently) and a smaller attribution line, without the poster having to format anything themselves.
Depending on people's layouts, I've seen this show up in slightly different styles, too - like with the quote text in red, or something.