What if I pretended to be an ex-twitter employee? How will they vet this as they aren't exactly going to get references from people when almost the entire company has been gutted.
See for example this dust-up about Apple:
https://www.washingtonpost.com/technology/2022/02/10/apple-a...
If they are concerned about vetting, paystubs and official bsckgroune checks are much better ways to go.
It's often not very difficult to create false records in these reports.
This is the same way companies check for dual employment.
Companies like ADP/Equifax provide services that will confirm past and current employment, income, ect.