Install:

install.packages("devtools")
library("devtools")
install_github("plotly", "ropensci")

Load:

library("plotly")

## Loading required package: RCurl

## Warning: package 'RCurl' was built under R version 3.1.1

## Loading required package: bitops
## Loading required package: RJSONIO
## Loading required package: ggplot2

Sign up online, use our public keys below, or sign up like this:

py <- plotly(username="r_user_guide", key="mw5isa4yqp")  # open plotly connection

It just works.

ggiris <- qplot(Petal.Width, Sepal.Length, data = iris, color = Species)

py$ggplotly(ggiris)  # send to plotly