Importing into Yahoo mail doesn't work for me since it halts at about 300 contacts out of 1500 (known bug).
migrated from superuser.com Mar 8 '13 at 1:05
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you can try http://rocketconnections.com It's a web application, you log into Facebook, then to Linkedin and it does all the work for you.
Get an account on http://www.gmx.com, import your Facebook contacts. Exporting doesn't work for me (it produces 0-length files), but this workaround did:
At this point you can send invitations to this list by pasting it into LinkedIn (Add connections -> Any Email -> Invite by individual email).
If you would like to screen the invites before they are sent, do the following:
Now you can import from that GMail account into LinkedIn, which will show you a list with names and pictures that you can choose to remove from the invite list.