I was looking at some pictures I took of these stray kittens in my backyard and I noticed that Flickr knows what kind of camera (FujiFilm) I have and what software (Photoshop CS) I used to edit the picture … and more! I did not notice that before … it's not like I mind, but it is a bit creepy.
Flickr does have a way to prevent this:
If you like, you can prevent the link to your EXIF data from displaying on the photo page. Set this in your privacy options.
Keep that in mind if you don't want me to know what camera you're using 
or just strip the exif before uploading your image.