Are project invitations ever real?

Since I joined PeoplePerHour last week, I've received 5 seemingly fake invitations:

• "Customer Service Representative" - moderated by Customer Support because it violates PPH terms & conditions
• "Remote QuickBooks Bookkeeper" - canceled
• "Landscape Coordinator/Bookkeeper" - more than 10 unanswered requests for clarification
• "Administrative Assistant /Front Desk Receptionist" - moderated by Customer Support because it violates PPH terms & conditions
• "Entry Level Medical Billing / Office Assistant Job" - canceled

Are buyers' credentials verified (as freelancers' are) before they are allowed to post a project or invite freelancers to a project?