If you wish to greet Sam just head to Twitter and follow his official account which is "@samuelmilby". But don't expect a response though since he has thousands of followers who are greeting him right now. :D
Meanwhile, here's a video of Sam Milby's Birthday Concert held at Zirkoh in Tomas Morato last May 14th.
Sam Milby has an upcoming movie with KC Concepcion titled "Forever and a Day", Check its trailer HERE.