In its analysis, NASA says it had verified the SpaceX cost figures.

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Though the guidelines are strict, they make for professional, gated communities on certain crowdfunding platforms that are vetted of established figures and verified companies.

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Tight restrictions on independent journalists inside Syria mean the figures cannot be verified.

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Syria restricts access to foreign media and casualty figures cannot be independently verified.

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The figures could not be verified.

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Twitter offers verified accounts to help us discern public figures from their imitators.

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On Wednesday, the firm released more detailed estimates of the amount of oil present and said its figures had been "independently verified".

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