What is the best web compression ?

Hi all web compression experts,
I have been trying to find out what is the optimum settings for files to be downloaded on the facebook. The limit I set is 100MB.
But when i rendered my 6.5 mins video in FCE, the filesize for the .mov file is a whopping 1.8GB. After much trial & error, I follow Diana's instruction in her Apple Pro Training book. Below is the summary of the steps she taught me in her book:
Video:
Compression: MPEG-4 Video
Frame Rate: 15 fps
Keyframe: 5
Data Field Rate: 700 kbits/s
Quality: Best
Size:
Dimension: Custom; I typed in 480 x 270
Sound:
Format: AAC
Channel: Stereo
Rate: 32 kHz
DESELECT prepare for Internet Streaming.
With the above settings, my file size has been reduced to 35MB. So I can still afford to add another 65MB before it reach 100MB. I tried to change the compression to H.264 but whenever this option is chosen, the file reach 400MB and took ages to render.
I have also change to the frame rate to 25 fps but there is no difference in the filesize & picture quality.
Can someone be kind enough to gimme some tips on what the numbers in the setting "Keyframe: 5" & "Data Field Rate: 700 kbits/s" do to the video ?
Is keyframe 5 better than keyframe 10 ?
Any suggestion?
Thnaks

skalicki` wrote:
Hi again Ryan,
I just got very good results exporting as suggested by Vimeo in this link:
http://vimeo.com/help/compression
Format: Quicktime Movie
Codec for video: H.264
Frame-rate: Current
Keyframes: Every 30 frames
Data rate: 5000 kbits/s
Size: 1280x720
De-interlace: Yes
Sound codec: AAC
Sound Sample Rate: 44.1kHz
Audio Quality: 128kbps
I didn't see much reduction in quality, and it reduced a 457MB file to 19MB. Judging by my calculations, if a 457MB file was reduced to 19MB, a 1.8GB file should be reduced to 72MB. Something to try perhaps?
Thanks skalicki`& dpapa,
I tried the above settings but it took ages to render. When it reached 45 mins, I gave up. By & large, whenever I use H.264 it takes very long to render !

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