Thousands of SnapChat accounts compromised, Nudes Leaked!
Hide Your Nudes: They’re Leaking Snapchats Out Here
Like Tiwa Savage, Cross's nude video ‘mistakenly’ leaked on Snapchat
Someone has threatened to share my nudes. What do I do now?
If you experienced in this, then well and good but if you are not then you would have to hire a professional hacker for this job.
Answer: It is impossible to get into someone's Snapchat with only username.
But it gets worse, much, much worse.