Facebook has more users than many countries.
300 million+
A while back, facebook was mostly populated by college students, but now everyone and their mother (often quite literally) uses it.
Advertising on facebook can help your business because it is where people spend a great deal of time when they use their computers.
You can also target your customers.
For example, your demographic might be females aged 25-30 who like jazz music. You could get your ads shown only to that population.
The people for which you feel your message best fits.
