I see what you're getting at!

You're saying that even though digital ads (e.g. online billboards) can be effective in their own right, they can also actually drive more engagement and visibility for physical billboards (e.g. traditional outdoor advertising). This is because people are already primed to pay attention to content on social media or other online platforms, so when a similar message is presented to them in the real world, it's likely to stand out even more.

In other words, digital ads can serve as a kind of "warm-up" or "preview" for physical billboards, getting people in the right mindset and making them more receptive to the message. This could be especially true for younger audiences who are accustomed to consuming information online and may be less likely to notice traditional outdoor ads.

So, while digital ads can certainly have their own benefits, you're suggesting that they can also amplify the effectiveness of physical billboards in a way that's hard to replicate through standalone advertising efforts.