📁 A common misperception is that works published on the Internet, including on social media platforms, are in the public domain and may, therefore, be widely used by anybody without the authorization of the rights owner. Any works protected by copyright or related rights – ranging from musical compositions to multimedia products, newspaper articles, and audiovisual productions – for which the time of protection has not expired, are protected regardless of whether they are published on paper or digitally. In each case you should, generally, seek the authorization of the right owner prior to use.

‎‍💻Some websites contain a general license that may exempt you from requiring a direct authorization for certain uses. Such licenses may authorize only certain uses, for example, some non-commercial uses. In practice, with regards to a text publicly available on a blog or a website for example, you may not use the text unless: such intended use is covered by the general license granted through that website; the use is covered by a copyright limitation or exception, or you have obtained authorization for such use. Similarly, authorization is required if your SME is engaged in publishing or making available copyright works, sound recordings, broadcasts or performances through your website.

Derived from https://www.wipo.int/copyright/en/faq_copyright.html