Here you will find every type of demographic(age, location, gender) audience.
nowaday organic reach of Facebook is low but it is amongst one of the best social media platforms for marketers.
You can post three types of content here text, image, video it is becoming old so basically if you want to run ads then it is the best platform because Facebook allows provide you with many values.
But if you want to play on Facebook then you have to pay for it otherwise it will not work for you
It is one more benefit for you if you want to spread brand awareness or want to build brand authority because on Facebook people like to watch live videos and it was seen recently that every person in a day watch three times Facebook live video, so there is a huge opportunity for you.