What does each Facebook Ref querystring parameter mean?

Does anyone happen to know of an article that explains开发者_开发问答 what each ref in facebook's querystring means? I've dug all over the place and can't find it.

<3 Facebook documentation /sarcasm

Thanks!

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Here's an unofficial list: http://fbdevwiki.com/wiki/Ref

{edit} there's also official documentation for fb_source here: https://developers.facebook.com/docs/fb_source/ {/edit}

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Here are the ones I've found thus far:

TS - Top Search

NF - News Feed

MF - ???