In all fairness the only people who ever saw a "landing page" were guests. One click and the wall was default... Now you have hundreds of pixels to promote your tabs where as before they were a tiny sidebar text link. More importantly over 90% of interactions happen through the feed -- and that increases as you grow your following. Thus the real "issue" is fan to post visibility, not landing page messages.
The point of social, and source of the best results, are not from turning channels into billboards but from creating something with enough compelling value that people engage, share and want to act on your brand after the initial click.