Some of the most important real estate in presidential politics is actually right in front of your nose. Or under your thumbs — it really depends on how you log onto Facebook.
The social network is now a key place for campaigns to advertise. One reason for that: It's getting easier and easier for campaigns to target those ads to very specific, tailor-made audiences.
"This is our hub of communication," explained Ken Dawson, who heads digital strategies for Ben Carson's presidential campaign. "We really see it as the heart of our campaign."