All of those things are covered by the ToS and EULA, in which the users give the social network a free license to use content as they see fit, including relicensing. At least all major SNS has this type of licensing agreement with users.<p>If the network has an embedding feature, then we must assume that the network allows embedding of content that the network has the right to distribute. I&#x27;m quite surprised if Instagram has an embed feature, but says you need to ask permission to use it.<p>If you download the content and host it yourself, that is of course different and you need permission from <i>either</i> the user or the network.