You can use images on social media if you reduce the size of the image to social enabled versions i.e. no larger than 1000 pixels on the long side and add the copyright information directly onto the image itself. The specific language for the copyright information should be in the license agreement but it should include copyright Adobe Stock/Artist name.
You can not use the images on any social media site that claims the copyright of the images uploaded. You need to make sure they don't send the images to websites that break our license agreement.