Grainy results when converting CR2 to JPEG

I'm processing raw images (.cr2) that have been taken under low light conditions. Originals in raw don't exhibit as much grain as the conversions to jpg.
Is there an way to minimise the problem?

Barbara B. wrote:
Sorry, ACR = Adobe Camera Raw. How are you converting these files, then?
Just size the image down for the forum, or include screenshots of sample areas instead.
Oh right !
I'm opening the raw image with control/alt/o then adjusting for best picture before opening in PSE9 & saving as JPG format. Saving as maximum quality "12".
Actually - and I hope I haven't sent you all on a wild goose chase - the noise problem was introduced when I uploaded my 9MB photo to FaceBook and was subsequently reduced in size by them. It rather sounds like it's FaceBook's conversion that's let me down!
Here's the problem - before uploading to FaceBook, and after... (and, yes, I know the original isn't perfect due to low light!)..
Before uploading to FaceBook.
After uploading to FaceBook.

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Grainy results when converting CR2 to JPEG

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