Ваше мета-описание именно так.Я думаю, что Facebook получает данные от него.
<meta content="As many as three thousand motorcycles are expected for Patriot Harley-Davidson's 9th Annual Ride of the Patriots, the dealership's Memorial Day Weekend caravan of bikers paying tribute to and raising awareness of American POWs, MIA soldiers, and veterans of war. After assembling at the dealership on Sunday, May 28th, the parade of bikers will follow a route to the Pentagon where it will join with as many as three hundred and fifty thousand other bikers from around the country before beginning a final, massive parade of bikes headed to the Mall and the Vietnam Veterans' Memorial in DC." name="description">
Я предлагаю вам также исправить это:
Inferred Property The og:url property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property The og:title property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property The og:description property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property The og:image property should be explicitly provided, even if a value can be inferred from other tags.