It has slowly over-taken Monster in Traffic.
This has happened recently – in last 2-3 months as the Alexa.com traffic shows it.
Expanding Reach of Indeed
It doesn't cost anything to add Jobs to Indeed and Indeed is expanding it's reach.
More Jobs Viewed on Indeed
More Page Views = More Jobs views for Job Sites like Monster and Indeed.
So, Indeed has larger number of page-views and has been on the rise since last 2 years consistently.
Where Monster Leads?
Time Spent on Site Per User!
Here is a link to full blogpost on this topic. Feel free to add your comments.