Can a employer threaten to fire you for liking a Facebook post about them posted from a friend

It would be very difficult for an employer to terminate an employee, with cause, for liking a Facebook post. If an employee was terminated, they would likely be owed both their statutory notice entitlements and common law notice entitlements. Attached is a link to our severance pay calculator, which shows what those common law entitlements could be (https://www.severancepaycalculator.com/).