Facts that are likely found using the surname search option include, but are not limited to, the meaning and history of the name, where the family lived and migrated to, immigration facts, and sometimes it will include the life expectancy and the most common occupation for that surname. It also includes interactive maps.
You can also find out lots of information by doing an internet search. Sometimes this helps us connect with long lost family, or helps us find important documents, photos, or if you are lucky you might even be able to tear down a brick wall that you've been beating your head over for years. Either way, I bet you will find out things you never knew.
I'll give you an example of how I would search for one of my families surnames. My grandfather was a Shrader and his family, from what I know, were from Tazewell County, VA.
When I search that surname here is what I enter,
"Shrader surname, Tazewell, VA"
"Shrader surname, Tazewell County VA"
"Shrader surname Tazewell"
"surname Shrader of Tazewell"
"surname Shrader of Tazewell County, VA"
"surname Shrader of Tazewell VA"
"Shraders of Tazewell County, VA"
"Shraders of Tazewell VA"
"Shraders of Tazewell"
"Shraders of Virginia"
I like to include the word(s) "Tazewell" or "Virginia" in with the search because it narrows the location down. If I type in, "Shrader surname" which is perfectly okay to do, the search results will be so wide that it will take forever to find more detailed information.
Just play around with the wording. You will get different results every time, but some of them will be the same. A careful researcher will do everything they can to learn and find as much as possible.