Battlelog's security certificate just expired, so your browser will show a scary looking message and ask if you want to continue or not. It should be safe, this is just an expired certificate, not a hack as far as I can tell.
Battlelog certificate expired, scary browser message will show
If you are still getting this problem, log into Origin first and then start BF3 from there. It will open your default browser and then prompt you that the certificate is out of date and you can accept it from there and proceed. You will then be able to join servers from Battlelog.
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