Emoji, the little ideograms or smileys, can be displayed in Windows and Mac OS by default. But Ubuntu does not support emoji out of the box in both 14.04 Trusty and 12.04 Precise.
Before and after enabled this feature, this is how a tweet client displaying emoji characters in Ubuntu:
So it’s quite easy to enable Emoji support in Ubuntu based systems. All you need to do is search for and install ttf-ancient-fonts package in Ubuntu Software Center.
Or install it via terminal command:
sudo apt-get install ttf-ancient-fonts
The changes take place immediately. Enjoy!