Would have to really go out of your way to avoid identifying stuff leaking like. Anything unique to a user could be searched for making any such measures redundant. Any unique quote or image used here, if on a FB profile as well could yield real-world ID for example. And though I don't know how, have heard you can do similar searches for images via some site or search string.
I once had the bad luck of attracting the attention of a real scum bag rw cyber-stalker so I learned my lesson the hard way. So, now, I'm very careful.
Its actually so very easy to find a whole hell of a lot of very personal and identifying info from the most innocent of posts.
But, apparently, the some posters don't mind.
Fact is, they haven't a clue about what info they're giving out.
Upload the picture to your Photo Album. Post it from that Image Link. No Trace.