Xperia Mini/pro :: Facebook Profile Picture Not Becoming Contact Picture After Sync?

I buyed sony ericsson xperia mini pro few months back. at that time i synced my contacts with facebook with facebook app. And i got all my friend's profile pictures as my contact pictures. But now when i changed my memory card i also formated my phone. I took backup of contacts on sim card. after installing new memory card i imported my contacts back to phone and synced facebook once again with my phone contacts. This time they got synced too but their facebook profile pics are not becoming my contact pictures. I also tried enabling facebook inside xperia but still it didn't worked. I want to get them done as quickly as possible.