I have only come across one post that showed images of their survival server and it is a little annoying, if you want to upload pictures you can look at the angle that you want to take a picture and then you press start then X I believe to upload to facebook. You need to log in to facebook on the xbox app: Facebook but then you can upload.
If you wan't to keep your photos private you can also just make a brand new facebook account and log in to that one so nobody see's it.
After uploading to facebook save the image on your computer then make your post with the picture on it so more people can look at your build and actually want to join your server!
You'll find out that when people post "wanted ads" for people to join their servers Applicants are never in short supply... Alot of people in fact prefer newer worlds as opposed to full built ones..... they'd like to feel like they were part of something from the start.
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If you wan't to keep your photos private you can also just make a brand new facebook account and log in to that one so nobody see's it.
After uploading to facebook save the image on your computer then make your post with the picture on it so more people can look at your build and actually want to join your server!
My thread has some nice pics check it out:
http://www.minecraftforum.net/topic/1835387-pics-city-rpg-survival-adventure-map/
pic: