7. Ark
Ark is a people finder. That’s basically all there is to it. But, it is an effective one. It uses data from all over the web to create profiles for more than 1 billion people.
The question of how to optimize our sites, and our online presence in general, to secure the top spots with these search engines still remains unanswered. But with time, the best practices will surely be revealed, so as always, success requires a lot of patience and even more testing.