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Twitter
Never found a sustainable business model that justified the considerable expense of running their site
Focused on customer acquisition and ignored growing churn and the market ceiling
The business model didn't work when trying to scale
Despite initial success, the business did not scale sufficiently enough to be sustainable and in a challenging economic environment for this type of business it shut down
Had too high of a monthly burn rate. At one point they were spending close to $7m a month. Was completely unsustainablee