There are thousands of companies like ZoomInfo. They all trade csvs of data of dubious origins, mash and resell it to the highest bidder. There is a tranche of these companies who build algorithms to do fuzzy linking between huge datasets, including sources like data breaches (where name/address info is included).
There are conferences. Much of the data can be obtained as Salesforce "apps" - connect your CRM to our massive data portal and we'll fill in information that you don't have. The biggest of these is owned by SF and called Data.com.
Not to hand waive away anyone's pre-baked hatred of Google/FB/etc., but there is an actual data industry that does buy and sell your data, with no controls over it and what it can be used for. By comparison, FB and Google are much better stewards.
There are conferences. Much of the data can be obtained as Salesforce "apps" - connect your CRM to our massive data portal and we'll fill in information that you don't have. The biggest of these is owned by SF and called Data.com.
Not to hand waive away anyone's pre-baked hatred of Google/FB/etc., but there is an actual data industry that does buy and sell your data, with no controls over it and what it can be used for. By comparison, FB and Google are much better stewards.