Is it permissible for a brother to add girls via Messenger and Facebook using a pseudonym, claiming to be searching for a wife, and is a girl who accepts his addition in this manner considered suitable for marriage and forming a Muslim family?

It is not permissible to get to know women, add them on Messenger, and talk to them under the pretext of searching for a wife. This is because a man inquires about the woman he wishes to marry through relatives or neighbors, and this cannot be achieved through the internet. Moreover, a woman who gets to know men and adds them to her list places herself in a position of doubt.