I have not seen live chat for weeks!!! on Soda or Candy crush. Playing W10, all up to date. I'm sorry to hear that. I hope you get it back soon, if you haven't already. Refreshing the webpage worked for me. Otherwise I guess I'd contact the Facebook support team, like Cezdiamond said. Best of luck to you.
Hi, it's me again. I just thought I'd let you know that I just got my chat back! I just went back and refreshed the page, and there it was. :) Hopefully others who have lost their live chat will get theirs back too.