| Description | Pinterest or Facebook |
| On Time's list of the 50 best websites of 2011 | |
| Released an iPad version | |
| Its CEO recently stepped down | |
| 483 million active users daily | |
| Global users up 272% in the last 3 months | |
| Headquartered in Menlo Park, California | |
| Fastest site to ever hit 10 million users | |
| No ads | |
| 83% of its American users are female | |
| No ads | |
| Hosts 1 in every 5 pages viewed on the Internet | |
| 250 million photos uploaded daily | |
| Made $1 billion in 2011 | |
| Does not have a presence on the other site | |
| Its CEO recently stepped down | |
| The 16th most visited site in the US | |
| 483 million active users daily | |
| Average daily time on site is 9-10 minutes | |
| Global users up 272% in the last 3 months | |
| On Time's list of the 50 best websites of 2011 | |
| Released an iPad version | |
| Headquartered in Menlo Park, California | |
| Fastest site to ever hit 10 million users | |
| On-site games | |