According to reports, Kate Furlong described her job loss and redundancy pay as the âbest news everâ in an update on the social networking website.
The 23 year-old is believed to have said she would be receiving a ânice payoutâ from the bank, which made her redundant in September of this year.
A colleague who saw the update reported Ms Furlong to RBS management who chose to let the employee go without paying her the Â£6,000 redundancy package.
The former-employee, who worked with RBS for three years, is now taking the bank to an employment tribunal claiming that she was dismissed unfairly.
She told the Daily Telegraph: âThe information was already out there and all I was doing was having a chat with mates.
''I'm taking them to a tribunal because I don't feel I should have been sacked. They got rid of me so they didn't have to pay any redundancy.''
RBS announced it was making 3,500 job cuts in September after more than 300 branches were acquired by Spanish bank Santander.
By Jim Ottewill