There isn't best way. Both are equally good and should be used all the time.
If You know a lot of people in person from your city, town or country that you see all the time, You could easier explain the SFI business and how it works.
Online recruiting (advertising, sharing, posting, commenting on social medias) has more people who will see, but if we look in percents, less than offline recruiting would be interested because they didn't have first hand experience.
Also, leaving business cards and flyers in restaurants or other public places will have almost same results as posting on Facebook or other social medias, the key is lack of first hand experience.
There isn't best way. Both are equally good and should be used all the time.
If You know a lot of people in person from your city, town or country that you see all the time, You could easier explain the SFI business and how it works.
Online recruiting (advertising, sharing, posting, commenting on social medias) has more people who will see, but if we look in percents, less than offline recruiting would be interested because they didn't have first hand experience.