One does not search a person. One searches FOR a person. A preposition (or prepositional phrase) is necessary to force the headline to make grammatical sense.

The headline, then, should have been either…

“Bing People Autosuggest makes it easier to find the person for whom you’re searching”

…or…

“Bing People Autosuggest makes it easier to find the person you’re searching for”.

The latter is the least formally grammatically desirable, but is more commonly used and less pedantic, and so is arguably more acceptable. Most grammarians would certainly argue for its use in the spoken word. As a headline, though, I would argue that the more formal former is better.

Either of them, though, is better than “Bing People Autosuggest makes it easier to find the person you’re searching”

To the article’s subject: It’s Bing, so who cares.

Gregg L. DesElms
Napa, California USA
gregg at greggdeselms dot com