A site's "similarity" is determined by how well its tag signature matches the tag signature that is being searched for.
A 100% match means that it has the exact same tags in the exact same order, while a 0% match means it has no tags in common.
Alex intently gazed in darkness waylaying his victim in the car.
Finally he saw her figure framed in moonlight, got out of the car and blocked her way.
Samantha was too drunk to notice a caution note saying that the restroom is temporarily out of service.