I usually crop, resize, and/or reduce quality before I post images anymore. I aim for images to be less than 500 kB before uploading unless it's that worthy of a zoom or the extra detail.

I don't think there's that much perceptible quality loss between an original 16 MP image and resizing it to 4 MP and 80%, but the image ends up around 90% smaller. This was basically how I had my digital point and shoot camera set up in 2008. My mom gave me a 256 MB SD card for it, and that went fast sometimes.