UPDATED | February 10, 2015 4:50 PM

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MANSFIELD (CBSDFW.COM) – Some people tweet about the things that they see, eat and experience. But a North Texas teenager was fired over what she posted on Twitter, before she even started the job.

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The teen was about to start working at Jet’s Pizza in Mansfield. But on the night before her first day at work, she shared her (lack of) excitement online.

“Ew I start this f*** a** job tomorrow,” said Twitter user Cella, adding a string of thumbs-down emoji characters.

Robert Waple is the owner of the pizza delivery and carry-out joint, and he found out about the tweet. He made sure that, if Cella did not want to work, she did not have to bother showing up.

Waple replied to Cella with, “And….no you don’t start that ** job today! I just fired you! Good luck with your no money, no job life!” His tweet was accompanied by crying emoji faces. It was the first time that he used Twitter since 2009, and his tweets have since been deleted.

Cella later told another Twitter user that she called the Mansfield pizza place, and another manager confirmed that she was indeed fired.

“This is just one of those gaps in really understanding that there are consequences for what you put out there,” said Kelly O’Brien, director of the Neeley Professional Development Center at TCU. “It never ceases to surprise that there just seems to be a disconnect, really, with today’s younger kids and the information they can post online thinking that it really is okay.”

O’Brien urges his business students not to assume there’s privacy on social media. He says they’re really forming a personal , lifelong business brand that an inadvisable posting can undo overnight. “And we need to be careful about what goes out there,” he told CBS 11 News.

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The teen’s Twitter feed is now filled with support from all around the world. Other online users have been quick to wish her luck and even urge her to get a lawyer. Not the case on CBS 11’s Facebook page where comments mostly ran against her.

“You don’t talk bad about your job on social media and not suffer the fallout,” said Leslie Sartor Brown. Another, Jay Shuffield, offered some consolation. “She’ll be doing pretty good if that’s the only mistake she makes as a teenager.”

O’Brien warns even posting under an assumed name in other apps, like Instagram or yik-yak, is inherently dangerous. “It may say that your post is anonymous, but there’s somebody out there that finds a way to tweak the application in order to find that person’s information,” he said.

Waple is the franchise owner and could have commented on camera if he wished, but he declined.

Jet’s Pizza’s corporate office responded, “We regret to see the manner in which this situation has been handled by the parties involved.”

Waple came under fire on Facebook, too. “The firing was justified. The response was unprofessional,” said Bob Trieger.

O’Brien agreed saying, “From my standpoint it gave a really negative perception of the employer because I don’t see that as being very professional.”

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