If you have Page or group on facebook reached 1000 fans or channel on youtube with subscribed, is that mean you qualified to receive advertising and get income or something like that !!!
Social media is not purely for monetary gain. It is a great way to network and meet people that you wouldn't necessarily meet on an everyday basis. You can keep up to date with the people in your network in a concise and engaging way. It is a great way to advertise yourself and for young researchers starting their careers it is worthwhile having an online profile that acts like an alternative c.v.