While it may be difficult to track specific sales off of Facebook (unless of course, it's a friend, or other specific circumstance etc), Have you thought of facebook as a way to drive traffic to your website? Do you have Google Analytics set up? What about another sort of website tracking? (most OEM back-end products have this built in).
Think of it this way - if someone is on your dealership's facebook page, & they click on your website - they know which website they're going to - so the bounce rate from these specific visits should :: in theory :: be relatively low.
It's just like if someone saw your vehicle on Cars.com/AutoTrader, but never e-mailed or called, they just showed up on your lot. If a facebook user doesn't "like" your page - are they still able to view it? Yup. Does that mean they can still click on the pictures/links you have on your page? Yup.
Instead of worry about actually selling cars on Facebook, worry about brand awareness and driving traffic to your website. If you put a picture of a customer who just purchased a vehicle up, make sure that customer is tagged, their friends will then see the picture (Facebook 101 here), those friends may "like" the specific picture & not your actual page, but they'll still know their friend bought their car from your dealership --> Brand Recognition. They may jump on your dealership page for a minute, snoop around & click some links -- to your website.
Think of it this way - if someone is on your dealership's facebook page, & they click on your website - they know which website they're going to - so the bounce rate from these specific visits should :: in theory :: be relatively low.
It's just like if someone saw your vehicle on Cars.com/AutoTrader, but never e-mailed or called, they just showed up on your lot. If a facebook user doesn't "like" your page - are they still able to view it? Yup. Does that mean they can still click on the pictures/links you have on your page? Yup.
Instead of worry about actually selling cars on Facebook, worry about brand awareness and driving traffic to your website. If you put a picture of a customer who just purchased a vehicle up, make sure that customer is tagged, their friends will then see the picture (Facebook 101 here), those friends may "like" the specific picture & not your actual page, but they'll still know their friend bought their car from your dealership --> Brand Recognition. They may jump on your dealership page for a minute, snoop around & click some links -- to your website.