The following is an excerpt from the MyHeritage Blog:
We did it again! We've just added 815 million US Public Records of people living in the USA to MyHeritage SuperSearch. This massive compilation of records was assembled from telephone directories, property tax assessments, credit applications, voter registration lists and other records available to the public. It includes information about hundreds of millions of people from the USA spanning the last five decades, making it one of the most powerful collections on SuperSearch for finding information about living relatives.
These records are excellent for connecting with relatives you find through MyHeritage Smart Matches and Record Matches.
Wherever the records include a full address, we've been able to deduce other possible relatives who were living at the same address. This can help you reconstruct entire households, determine if the records are relevant for the family you are seeking, and discover additional relatives you didn't previously know about. Other important information in these records includes birth dates, aliases, possible relatives (and their birth dates), as well as business associations and, where publicly available, contact information such as phone numbers.
You can read the full article at http://blog.myheritage.com/2014/02/new-815-million-us-public-records-added/.