Hugh Pickens writes "As we celebrate America's birthday today, head over the to the NY Times and take a look at a very clever 'op-art' creation, 'Like it or Unfriend It' by Teddy Wayne, Mike Sacks, and Thomas Ng, that represents what 'America's Wall' would look like through our history. Beginning with 'Christopher Columbus wrote on America's wall: 'This IS India, right?,' through 'America added Great Britain to Kingdoms I am Fighting With,' through 'The South has changed its privacy settings to accept carpetbaggers,' and finishing with 'America stopped playing the game Wild-Goose Chase While Nation-Building,' and 'America has joined the China Network' the wall includes dozens of invitations, likes, posts and changes to privacy settings that shows a summary of American history as seen from a Facebook perspective. Our favorite from the 1980s: 'Ronald Reagan created a page: "Trickle-Down Economics" followed by "Half a million upper-income people like this.'" For another take on 4th of July data visualization, Tim O'Reilly points out flag.codeforamerica.org, which aggregates twitter posts tagged #July4 into an evolving flag tapestry.