I use Aperture and constrain the jpeg on export to 1000x1000 and use a quality setting of 4-6 depending on the shot. If there is a lot of sky you can use less compression, a real busy scene you need more. 150kb is very limiting however, right on the edge of the image going to shizz (many of mine have) If you constrain to 800 or 640 pixels you can use less compression and have a better looking post as well.
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