Im building a simple website where people can save links and eventually share them with others.


When a user enters an url, I fetch the meta data to present the link. 
The text, like title and description, Im just saving in a database however Im in doubt what I should do with the image.


Should I just always deeplink to the external image? Or can I save the image on my server? What are the legal options here?
I can see that facebook seems to save their own copy of images that are shared through them.


(The image will always be used in context with a link to the original link)



How to legally serve og:image