As the chart above shows, the 1Q14 ARPU for Google (GOOG) was six times larger than that of Facebook. Twitter (TWTR) saw a bigger percentage increase during that quarter than Facebook or Google. All three companies continued to grow their ARPUs strongly and had aggressive plans to increase advertising revenues in 2014 and 2015.

When it came to ARPU, Google dominated Twitter and Facebook by a wide margin. However, Google’s year-over-year ARPU growth rate slowed from 14% in 1Q13 to 8% in 1Q14.

Meanwhile, ARPUs for Facebook and Twitter have been increasing rapidly. Facebook and Twitter’s ARPUs grew by nearly 60% and 80%, respectively, during the first quarter of 2014.

All of this suggests that Facebook and Twitter’s ARPUs still have a lot of potential for growth. Conversely, Google’s ARPU seems to have matured and leveled off.