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The technique for showing several pictures in a Flutter post in a way reminiscent of Facebook is by using the Flutter GridView widget with a crossAxisCount of 3 or 4 to display the images in a grid-like layout. Images can also be displayed in a Wrap widget, which allows for a flexible display of images depending on the screen size. To make the images clickable or tappable, wrap them in a GestureDetector widget and provide a callback method to handle the tap event. Additionally, you can use Hero widget to add a smooth and visually appealing transition animation to the images when clicked or tapped.