I suggested "Instagram". It is a social network platform that provides a great value to reach those people from every corner of the world. According to the last update of 2020, there are more than 500 million daily active users.
What do you mean by your question? If you are asking for a platform to post images it'll depend on the type of it, for example Instagram has it's type of images but if you are a photographer you should post on 500px. .Etc