Each account differs and has specific verification documents. All accounts can attach social media info as a way of verification. Below is a list of a few items required to have a verified account.
Homeowners- Drivers License, Utility Bill, Property Tax Statement, links to other websites where they are already hosting like Airbnb and HomeAway.
Agency- Tax ID, housing recruiter contact, email of the person creating the account, and company website.
Traveler: Drivers License, copy of your travel contract, picture of your work badge, practicing license number, state and board website to verify.