Here's one ethical difference between Facebook and Twitter: Twitter announced they are taking up offices in San Francisco, a decision that contrasts the move being planned by Facebook. Its new headquarters will be out in San Mateo County, continuing a pattern of sprawl in the area. Facebook, which has 2,000 employees now, will be remodeling the office park to be more like a real city. Twitter, which could grow from 450 to 2,600 employees in the next six years, will be in an actual city.

The Twitter location happened because San Francisco officials wanted to spur the revitalization of a downtrodden neighborhood and made concessions on the city's controversial payroll tax. It was a decision that somehow merited this ridiculous animated Taiwanese video treatment after the jump.

Here's what Twitter's official blog said about the decision:

We are proud that Twitter will be among the first companies moving into the Central Market area and will be playing a role in its renewal with the city and with other businesses, arts organizations, and the numerous community organizations that have been doing hard work in the neighborhood for many years.

San Francisco's unique creativity and inventiveness is a part of Twitter's DNA, and we feel like we are part of San Francisco. Three-quarters of our employees who live in San Francisco are involved in causes and charities in the city. Our employees are excited to be active members of our future neighborhood as volunteers, customers, diners and patrons of the arts.

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