@AMDG You don't need to re-create your post on meta. There is a process for migrating posts automatically to the correct site once enoufgh people indicate it should be there. The migratuin should happen on its own.

An image sharing site is a site like ImageShack, to which you can upload images and be given a link to that image. You can then put a link to that image in your post. When you do that, it's likely that a member with more reputation (and thus the right to include images) will edit your post to include the image directly.