But as inner cities gentrify, the poor are being displaced, and it has created real friction in San Francisco and Washington.

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Behind the clichs are some real friction points, and they go way beyond how people dress or what company dining rooms look like.

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This real-time aspect removes a lot of friction photo sharing process, Gil says.

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That doesn't mean there won't be real differences over settlements, for example, that won't cause friction.

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