I recently referred a co-worker to TDAmeritrade. I was supposed to get $50 and he was supposed to get 5 free trades. Well neither of us got squat so I had him call customer support. At first he didn’t believe there was an such promotion so I had to tell him to look on their website’s front page. In about 4 minutes he agreed and gave us both 10 free trades!
I think the promotion is still valid.