Problems with nikon D3000?

Ok so i can upload my picturs from my camera to my computer but i can't upload them to socal websites like facebook.
when i do they come out real small:/ it would mean a lot to me if you could tell me what to do.

If this is a recent issue just happening then its most likely just facebooks fault. If not try resizing your images to suggested sizes and try that.social websites don't like big image files or sizes