Kelley Blue Book | 27,295 followers on LinkedIn. Kelley Blue Book, The Trusted Resource®, provides vehicle valuation and digital marketing solutions that drive results. | Founded in 1926, Kelley Blue Book, The Trusted Resource®, is the vehicle valuation and information source trusted and relied upon by both consumers and the automotive industry. Each week the company provides market-reflective values on its top-rated website KBB.com, including its famous Blue Book® Trade-In Values and Kelley Blue Book® Price Advisor tool, which provides a range for what consumers can reasonably expect to pay for a vehicle in their area. Car owners looking to sell immediately can also get a redeemable, transaction-ready offer with Kelley Blue BookSM Instant Cash Offer.