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Number1 the most important problem is to find the right person for required position. And the some other are the source you are trying to do business with.
The biggest problem is lack of trustworthy enviornment from both sides i.e. seller and purchaser.
Some of customer fails to pay the bill.some of not able to gave the exact location.
Bots, they fill up many things online which cause you to question the numbers provided by the networks you work with. Fake accounts are also leading in this, where you always face irrelevant numbers on accounts and the place of origin.