Every single media out there is worth looking into.
You simply have to assess if:
1) It's easy enough to advertise there
2) Volume is sufficient for a local business to advertise
3) You can track KPIs
and most importantly, 4) You're willing to craft the offer in line with the target market.
For example, you could appeal to DIYers on Pinterest, with an SUV that's Roomy for kids but also when loading up old furniture from Craigslist!
The errors most dealers do is create one single message and spray all sources. Then determine which media is good or not. With proper offer creation, there's a way for everyone to make any media resonate.
If I was to talk about chocolate here on DR, it wouldn't mean I'm not relevant, just not relevant HERE.
I would not be aligning Media / Message correctly.
If anyone here tries Pinterest, align the message with the Audience, and let us know how it goes 
