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Lay the cards on the table... Eventually, it won't be good marketing if you didn't help you're client.

You can propose to create a MVP and just show screenshots of early twitter and facebook...

Say it will cost him less money and it will help him validate the idea. Show him some Analytics of some of you're apps.

Most people I've talked to don't understand the idea of an MVP and believe EVERYTHING they want in a product is an MVP.

Use Trello to seperate stuff if you're working with people who don't understand it... :)

Then notice that most of the stuff for the finishing product is in the current sprint backlog and explain that ain't a MVP.

Then start to filter stuff away for what isn't "required", the more you filter, the more it will become an MVP.