back in march, facebook removed the default landing page feature as part of the shift to timeline. developers of landing page tab apps felt the pain, losing a ton of volume. a few are coming back, however, as this article in inside facebook describes. reason - the landing page isn't dead, you just have to work a little harder to get new visitors there. read the whole article there.
The key difference since Timeline is that now page owners have to actively promote their tab applications, whereas previously the app was the first thing new visitors saw when they came to the page. Woobox’s DeCarlo says he immediately recognized this and when Timeline launched, Woobox added a feature to give page owners a short shareable URL with a customizable image, headline and summary that would appear when the link was posted to Facebook.