| http://www.w3.org/ns/prov#value | - For the first four years or so of its existence, Twitter relied heavily on -- and encouraged -- external developers to provide extra functionality around its bare-bones microblogging service.During that time, Twitter, founded in 2006, had its hands full keeping up with the basics of running the company, such as maintaining the site up and available, a notorious struggle for years.Thus, developers
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