The Ticker: Lance the tamperer?; White House vs. press corps; Lohan vs. Lauer; Winklevii drop appeal; Foursquare + AmEx

VeloNationLance Armstrong investigation: Former federal prosecutor speaks about possible witness tampering charges

FishbowlDCBad Blood Brewing at White House Between Press Corps and Flacks Over Presidential Address

TMZLindsay Shuts Down Matt Lauer Interview IN HIS FACE

ReutersWinklevoss twins end appeal of Facebook settlement

MashableFoursquare & AmEx Take Checkin Deals Nationwide