"social_links": [
{
"type": "facebook",
"url": "https://www.facebook.com/XXXX"
}
]
The reverse append used to be the favorite of the direct mail industry that was the most sophisticated with modeling before advent of the online ecosystem.
You can infer a lot about the person from their profile if it's public and also can try to match back to existing customer records if it's private.
EDIT: "reverse append" is the act of appending data to a phone call record based on the phone number.
> DOB, Gender, Marital Status, Household Income, Home Ownership Status, Presence of Children, Home Market Value, Length of Residence, Hight Net Worth, Occupation, & Education Level