What web technology can I use to allow visitors to up load photos and comments to my

I have a website and would like to allow visitors to upload photos from their computer onto the site what type of web technology will I need to do this also if I want users to add comments on the site how do I do this. It is kind of like face book where you can add photos and comments and then within seconds they appear on the site for all to see.

You can use FTP, but then they could shut down your site. I'd recommend using PHP scripts to upload and post comments