I've noticed this issue just recently, after upgrading to WordPress 3.1.1.
Three posts were scheduled earlier this morning. On all three, the Facebook like/share buttons were linked to the homepage. In other words, no one could "like" the new post; if you tried sharing it, you'd actually be sharing the homepage.
As a test, I tried scheduling another post this afternoon and ran into the same issue.
Posts published regularly don't have that problem.
Any ideas as to why this is happening?
Any assistance would be much appreciated.