You can do it very easily with UltimateWB. It has all the built-in apps you need to build a website like Pinterest. The built-in photos app would be great for it. If you want to allow posting for videos too, use the built-in scrapbooks app. I would first use the built-in Templates app to build out sections of the website, and then the website admin panel to customize. UltimateWB is very flexible, and no experience necessary.
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