We use Adobe Stock to buy images for our newsletter or social media channel. We always insert the copyright in the pictures. However, since this is very complex, I checked the license terms of Adobe Stock to see to what extent this is necessary. Accordingly, the copyright for images that are noted with the note "for editorial use only" must be specified. But what about pictures that don't have this hint?
Furthermore: …""Social Media Site" means a website or application which has a primary focus on facilitating social interaction among its users and allowing users to share content in connection with such social interaction."