The latest Facebook research shows that combining outdoor advertising and advertising on Facebook significantly contributes to the effectiveness of advertising campaigns.

While examining the specifics of the relationship between outdoor advertising and Facebook, this approach has been recognized as a part of the strategic media mix.

The benefits of combining outdoor advertising and Facebook are clearly seen when advertising consumer brands, especially in the awareness phase.
Increased exposure to advertisements combined with fast connection via social media apps helps direct consumers towards product offers and increase their awareness of advertised products.

You can find the research on the following link.