I just had a very good experience with FB-Helpdesk :

I wanted to book two award tickets sxb-ory-cay-ory-sxb for two people combining two accounts. So I called FB-Helpdesk. Flights were available without any problem and the whole booking took 5 minutes.

Five minutes after the call I had two e-tickets ^ in my box

Very good and friendly service.

THX Flying blue