Emoji info - I learned something new on Facebook yesterday. I noticed that I no longer had an icon to select emoji's/emoticons. After fiddling with it for sometime I realized that this started when I updated my PC to Windows 10. After some research I found out how to do it, and it works for other programs like this one.
On a Win 10 PC you have to right click the mouse in the windows task bar to bring up a new pop up window. Click on "Show touch keyboard button". It will place an icon in the bottom right of the taskbar that looks like a tiny keyboard next to the date and time. When doing a reply click on that icon and select the smiley face and select the emoji that you want and it will place the emoji wherever your cursor is. The icon stays in the taskbar until you toggle it off. 😀