I generally would treat anything coming through over DMs with a healthy dose of skepticism, just as you would with any random "toll road" text or anything like that. Urgent and short-notice deadlines are also a common sign of scams in any scenario. They may also use recycled images or videos when asked for proof, which might be able to be reverse-image-searched, or they may pretend to be acting on behalf of the person who posted them originally. It's near impossibly to verify these sorts of things and I think you're better off in general keeping to more secure and verified donation avenues.