If they are telling the truth, they are doing themselves a disservice without anything to back it up. Going to social media still means people willing to fight for the victim need something tangible to work to succeed.
This is why I stressed more women reporting rape in that thread about rape victims not doing it. Because technically, a person can be judged as wrong if they throw accusations at someone without proof in a court of law. Waiting years after the fact does indeed make things difficult, if not impossible. When that happens the situation is indeed fucked as now they have to hope someone is sympathetic enough to believe them.
And in the US, you're race could also play a part.