someone is using my sisters cell phone number on a fake facebook account
No, that is not lawful and it is against facebook's policies. Contact Facebook and the local authorities at once. Best of luck - Reese Serra
This advise is only being offered as a courtesy. We do not have an attorney-client relationship and I do not represent you. Additional, the advice I have provided was based on the limited fact pattern provided by you. If the facts differ, my advice may not be correct. If you live in Michigan and would like legal assistance with your issue, feel free to contact me: 586-615-0756
1 lawyer agrees
Real Estate Attorney
You potentially have a claim for Invasion of Privacy. Consult with an attorney
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Lawsuit / Dispute Attorney
Overall I agree with the other attorneys. You might have claims for defamation and also there might be specific cyber stalking laws. Overall it is not appropriate.
This not meant to be legal advise. It is not possible to know everything about your issue in this forum. You should consult an attorney if you want a full answer to your question. I will not be taking any other action on your issue. I only work with clients when they have signed a client agreement with me and provided me with a retainer.