You may be eligible for probation, but whether it will be offered by the State in a plea bargain or granted by the Judge in your case depends on the specific facts. Start talking with local attorneys, and QUIT ADMITTING TO FELONY OFFENSES ON THE INTERNET. Law enforcement monitors these sites.
Let's start with STOP POSTING ADMISSIONS TO CRIMES!!! Probation may be possible but....I would be getting myself an experienced criminal defense attorney to represent you. This is a felony. All for a pizza.....
Robbery is one of those violent offenses that may or may not get you probation on your first offense. It can depend on the facts of the case, the attitude and habits of the DA's office, the judge in the specific court you're charged in, and the county in which it occurred. Things like your age, employment status, and other issues may all be factors that determine whether you can receive probation. You want an experienced criminal defense attorney, and you want one fast.
Also, as the other said, you should immediately stop making statements that admit participation in a crime on any and all websites and social media.
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