Are you in the US by chance? To my knowledge this is not the case anymore in the US if you land on Pinterest via Google Search unless you try to take an action that only makes sense for an auth’d user (such as saving a Pin). I would like us to expand this to more countries but it is not my call.

If you aren’t in the US, could you provide an example of us throwing up a login screen if you click on an image? I don’t think we do that until scroll down to see more Pinterest content.