What is postmodernism? After, modernism, po-mo in your world/culture?

Postmodernism to me would be the movement of art, architecture and other aspects of life that you can expresses yourself verbally through media. As years have gone on I think that people have really taken the POST part of postmodernism to the extreme. You can basically post your life story and where now. Twitter, Facebook, Instagram, for anyone in the word to see. These are someone of the example of postmodernism in our world and culture now. I can go onto to Facebook at the end of the day and have a full outline of someones day through things that they have written about there day, posts they have commented on, pictures that they have uploaded and things that they have liked and shared. noting is really private anymore. I honestly think that it is bad because people can stalk you and know where you are just from what you have POSTED from that day or even that week. Modernism to postmodernism has changed a lot I think mostly because of all the technology advantages that we have now. Some my think that its a good thing but over all I think that it can go either way.