Twitter offers complete tweet archives The archive comes as a compressed .zip folder, containing members' tweets in .csv spreadsheet format, and as .json file, a format often used to transfer and represent data online. Metadata, such as location, is also included. The development delivers on a promise from Twitter chief executive Dick Costolo that members would be able to access old tweets. Facebook already allows its one billion members to download their archive. Twitter's engineers have met a public deadline set by Mr Costolo of providing the feature by the end of 2012. He said they complained at the complexity of archiving every tweet since the service was introduced in 2006. "Now, again, once again, I caveat this with the engineers who are actually doing the work don't necessarily agree that they'll be done by the end of the year, but we'll just keep having that argument and we'll see where we end up year-end," Mr Costolo said last month. The email delivering the archive carries a warning for members to be careful about sharing their archive as it "may contain sensitive content."