If you weren't able to connect to Facebook and import your "liked" artists, it may be related to your Facebook privacy settings. The following steps may resolve the issue:
- Login to Facebook
- Click on the "Account" menu in the top right corner and select "Privacy Settings"
- Under "Connecting on Facebook," click "View Settings"
- Under "See your likes, activities and other connections," select "Everyone"
- Now import your favorite artists from Facebook again.