First you need to ask yourself WHO did the seeing.
Once you figure that out, you'll be ready to revise this sentence.
Change passive voice sentences to active voice sentences.
The “Open Happiness” message, the 2009 Coca-Cola marketing campaign, was seen in stores,
on billboards, and in television and print advertisements along with digital and music
components—including a single by Janelle Monae covering the 1980 song, “Are You Getting
Enough Happiness?”
4 answers
Drivers saw the billboards?
Did people in stores, those who saw TV and print ads, etc., NOT have exposure to the campaign?
10 cose che non sai (e che dovresti sapere) sul pignoramento della casa