Praise be to Allaah.
What the Muslim is required to do is to be honest in all his statements, whether he is talking about himself or someone else, verbally or in writing, because Allah says (interpretation of the meaning):
“O you who believe! Fear Allaah, and be with those who are true (in words and deeds)”
al-Bukhaari (6094) and Muslim (2607) narrated that ‘Abd-Allaah ibn Mas’ood (may Allah be pleased with him) said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “I enjoin you to be truthful, for truthfulness leads to righteousness and righteousness leads to Paradise. A man may continue to tell the truth and endeavour to be truthful until he is recorded with Allaah as a speaker of truth. And beware of lying, for lying leads to wickedness and wickedness leads to Hell. A man may continue to tell lies and endeavour to tell lies, until he is recorded with Allaah as a liar.”
Whatever a person writes about himself or his situation on Messenger or any other website or means of communication, he must be truthful in it. It is not permissible for him to write about himself that he is outside or in school, for example, when in fact he is at home, because this is lying. If he forgets to change his status (by typing or writing), he should change it whenever he can.
And Allah knows best.