Is putting a fake ssn on paypal illegal?

It is fraud, yes. They will just disable the account.

Actually yes it is according to the USA Patriot Act.

Of course it's illegal - why wouldn't it be. If you never used it and they contact you just say you entered the wrong number by mistake. If you used it however you could be charged if they decide to contact the authorities

Think "fraud."

Of course it is. I think you need to learn what a joke is. A joke is something that makes the teller & the receiver of the joke laugh. What you did was stupid and childish.

Using a fake SSN for ANY reason is a crime.

Credit fraud, wire fraud, possible identity theft. You tell me.

Yes

Committing fraud is a crime.

You may have simply entered the wrong SS# in error.

You are allowed to make a mistake.

If you are an occasional user of PayPal who is involved

in only small monetary transactions you have nothing

to worry about.

FRAUD

Don’t be so sure that it is fraud.

There may be no law obligating you to give your real SS#

to a private company.

The fact alone that PayPal is requesting it is not a definite

indication that you are legally obligated to provide it.

Yes it's illegal. You could be charged with fraud, identity theft and any other number of other things.

Will you be? I doubt it. Most likely they will simply reject your data.