Read your employment contract. If you're in the IT sector, I'm sure it has stipulations about what kinds of information about the company - photos, location, employees, etc. - can be published in news sources or on social media. Even if it doesn't specifically prohibit doing what you want to do, your company can simply call your photos a security breach, and you could still be very quickly fired for it.
Update 11/04/2018
Read Termination of Employment | gov.ph Bureau of Labor Relations
- May an employer dismiss an employee? What are the grounds?
Yes. An employer may dismiss an employee on the following just causes:
a) serious misconduct;
b) willful disobedience;
c) gross and habitual neglect of duty;
d) fraud or breach of trust;
e) commission of a crime or offense against the employer, his family
or representative;
f) other similar causes.
Can your actions of posting photos be construed to be any of the above? Have you been instructed - or is it in your contract - to not advertise your employment or break security protocols by posting photos of the office? Would it be "willful disobedience" or "breach of trust"?
And read 2018 Guide to Terminating Regularized Employees - Lawyers in the Philippines - lawyerphilippines.org
You can terminate due to just cause when the employee is at fault.
Just causes are listed in Article 282 of the Labor Code and reproduced
below:
• Serious misconduct or willful disobedience by the employee of the
lawful orders of his employer or representative in connection with his
work
• Gross and habitual neglect by the employee of his duties
• Fraud or willful breach by the employee of the trust reposed in him
by his employer or duly authorized representative
• Commission of a crime or offense by the employee against the person
of his employer or any immediate member of his family or his duly
authorized representatives and
• Other causes analogous to the foregoing
Can your actions of posting photos be construed to be any of the above?
Do you have money to hire a lawyer if fired? Do you feel like you can prove that your firing was wrongful? And that you have no liability for posting the photos?