Por fa

Por fa
 

¿Se usa por "por favor" en español neutro o en español de España solamente?

(Does it sound neutral or like a Peninsularism?)

The words are usually combined when written (porfa), but it's just as simple to write out the entire phrase. The abbreviation, in speech, is heard everywhere, and there are a couple of variations - porfa, porfi, porfas and porfis come to mind.

I believe the abbreviated forms to be very colloquial, and mostly used by children. Wait for a native speaker to confirm, but I would rule against using them in any formal setting.

I guess it's used and understood everywhere. It's extremelly informal (not vulgar, though). Something you use with your close friends and siblings.. and that's about it.
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like what's the diff in English