After a little bit of playing with the site, you can tell the initial 80 million are based off the SSDI. All facts are displayed on a timeline, and if location are entered, it also shown on the map. With ease you can connect to people together, say Mother/Son. Thats what I did, and took all of about 2 minutes.
The one thing is, this is another website to upload everything to, what would be nice to see the Footnote Pages somehow parse a GEDCOM check vs Pages already created, and merge/update/create depending on the circumstances.
For a quick Mother/Father/Children setup its probally excellent. I hope the other web based genealogy system check out FootNote Pages, make notes and update their's to be more competitive.