Deputies don't call and make threats, and they certainly don't tell you that they are turning cases over to other agencies. In fact, they almost never turn cases over to other agencies. Sounds like someone was lying to you, but I can't say for sure. Either way, I hope you learned your lesson.
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It is interesting that the phone number that called you was the listed Sheriff's office number.
Yes, you could have some liability here. I would stop posting information on public forums about this. If you are contacted by the authorities in the future, don't say anything without hiring a lawyer before you speak.
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The brief answer is that it depends on the privacy rights in Florida. Nevertheless, in most states there are no criminal penalties for such activity, UNLESS your state has enacted some type of anti-bullying statutes. This type of activity could fall under such a statute and subject you to legal recourse. Just remove the post and stop doing things of this nature.
The answer to the question above is general advice and does not constitute legal advice or create an attorney-client relationship between you and I. Before pursuing any course of action relating to the question herein, you should consult an attorney.
Don't fall for that probable spoof. Surely you don't plan to call the sheriff and self-incriminate by explaining what you did and asking if they called.
I am not your lawyer and you are not my client. Free advice here is without recourse and any reliance thereupon is at your sole risk. This is done without compensation as a free public service. I am licensed in IL, MO, TX and I am a Reg. Pat. Atty. so advice in any other jurisdiction is strictly general advice and should be confirmed with an attorney licensed in that jurisdiction.