Debt collectors can sell your debt to another collection agency, so in that sense they would be sharing it. If you don't have an attorney, a debt collector can contact other people only to find out your address, home phone number and where you work. And the debt collector can only contact them once. If you have an attorney regarding the debt, the collection agency can only contact your lawyer.

Collection agencies are governed by the FDCPA. Fair Debt Collections Practices Act. You can go the this site for the law and you can read this Factoidz concerning what collection agencies can and cannot do.

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