Why are my photos not as sharp when I import them into Facebook from the Aperture Projects file, compared to when I 'share' them with Facebook within the Aperture programme? There is a noticeable difference and has been spoiling my photos for some time.

Hi all, I take wildlife photos (mostly birds) as a hobby, and have become frustrated with the quality of my photos recently when shared online, particularly Facebook.
I started blaming my camera ( a Canon 7D) as I changed it a few months ago from a Canon 550D, and I soon noticed that the images were not as good. Then I realised it was when I started using Aperture.
I started by using the 'share' option within Aperture but I soon realised that then I have no control over the creation of an album, and the photos start appearing on facebook before I have finished uploading them and given them captions. Plus if I subsequently move them or export them to my back up drive then they disappear from Facebook!
So I started creating albums within Facebook and then importing the photos from the aperture projects file on my computer. Because they are imported I can then delete or move the aperture file and the photos stay on facebook. Otherwise my macbook was becoming completely full.
However to test my theory I have today uploaded the same photo edited in Aperture stored in the same projects folder using the two different methods described above, and there is a very distinct difference between the quality of the two images. The shared ones are very much sharper than the imported ones.
I am a computer novice and don't know how to check what the quality settings are, or how to adjust anything to improve the way the photos go into facebook. I do have a manual but I just cant understand it :-(
I have tried a free sample of Lightroom 5 and my photos  look amazing, there is such a difference, but I don't want to give up with Aperture unless the problem really can't be solved.
Sorry for such a long first post, I would be very very grateful for any help you can give me!
Regards
Susan 

Generally I would not use Facebook for sharing any photos, it compresses the photos substantially, and when you have shadows and dark colours you get visible "bands" where there should be subtle gradients, ie at sunsets and sunrises.
It sounds like you are using two methods to upload to Facebook:
1. Sharing from within Aperture, which basically syncs Facebook with your Aperture album, so any changes made at either end gets synced, hence the deletions from Albums, although the original file should still be in your library, just removed rom the album. It is like a playlist in iTunes.
2. Exporting pics and uploading to Facebook from the browser.
I am not sure how method 1 gets compressed, but I know that uploading hi-res jpegs to Facebook using method 2 results in poor quality images.
I wouldn't even bother comparing option 1 or 2, and they will both be poor images once you view them on Facebook, as opposed to viewing uploaded images on proper image sharing / hosting sites.
Your problem is not with Aperture, it is using Facebook for showing your work.
If you export pics form Aperture at high res jpegs or TIFFs your images will be fine.
If you insist to use Facebook as your way to share your work, then your workflow should be this:
1. Right click images you want to share.
2. Select Export version.
3. Export as 100% size and ensure the export settings are set at 100% quality.
4. Upload this pic into Facebook.
This will get you the best image size and resolution on Facebook.
See how you go.

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