Are EXIF ​​data deleted by iOS and / or Twitter in image tweets?

Question

I am trying to tweet an image from an iOS5 application with this code:

TWTweetComposeViewController *tweeter = [[TWTweetComposeViewController alloc] init]; [tweeter addImage:image]; 

I think my EXIF ​​is being deleted, but I'm not sure if it is my fault, the iOS code on Twitter or the Twitter service. I have not yet found a reliable answer, but how can I post photos with geotags on twitter? seemed to point to Twitter, and the photo-sharing on Twitter starts live for all users who had this in their news feed:

Photographers will be interested to know that all EXIF ​​data, information that determines which equipment was used for photography, as well as the settings used, are deleted from photos after loading

I am trying to find an official source or better authority than my code. I also tried to tweet the image from the Photos app, which seems to have lost EXIF ​​(location) data after uploading.

Answer 1

Twitter Help Center :

What happens to Exif data? I heard that there are privacy issues.

We delete Exif data at boot time. It is not available to any consumers of your image.

Answer 2

Just found social networking sites: photos metadata test results that have been tested by various sites, including Facebook, Twitter and Google+. An excerpt from his website says:

We uploaded a test image with embedded metadata and checked if any of the built-in values ​​are displayed, and if so, which ones. In the form of the next step, we tried to save the image from the network of social networks of the site or system on our computer, and then we checked which metadata of the field is still embedded.

Twitter test results (as of March 2013):

Metadata not shown, all embedded metadata removed from image files.