A nonprofit files a single Form 990 once a year. It can take 12 to 18 months to appear publicly. It doesn’t require audited financials. GiveWell has noted that the form doesn’t provide sufficient information about what a charity actually does or where it operates. And nonprofits with less than $50,000 in revenue don’t have to file one at all.
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，更多细节参见PDF资料
runtime semantics，这一点在新收录的资料中也有详细论述
Some free dating apps are better suited for casual flings or hookups (e.g., Tinder, Grindr, etc.), while others have matching algorithms and profile features specifically designed to help users find meaningful connections (e.g., eharmony, OkCupid, Hinge, and Coffee Meets Bagel).。新收录的资料对此有专业解读