emojifont is available in CRAN, you can use the following command to install it.

install.packages("emojifont")

An example of using emoji font in R plot is showed below:

More example can be found in the post and online vignette.

I found FontAwesome is quite interesting especially in technical world. In emojifont (version >= 0.3), I have packed the Font Awesome. So that we can use this fancy font in both base and ggplot2 graphics.

load.fontawesome()

set.seed(2016-03-09)
fa <- fontawesome(c('fa-github', 'fa-weibo', 'fa-twitter', 'fa-android', 'fa-coffee'))
d <- data.frame(x=rnorm(20), 
                y=rnorm(20), 
                label=sample(fa, 20, replace=T))

ggplot(d, aes(x, y, color=label)) + 
    geom_text(aes(label=label), family='fontawesome-webfont')+
    xlab(NULL)+ylab(NULL)

Have fun with emojifont.

@drob and @guangchuangyu, this is data surfing (air quality data from Lima, Peru) / fun with your cool pkgs. Thx! pic.twitter.com/ikinjxDDZL

— Maëlle Salmon (@ma_salmon) March 6, 2016