• This works with Mozilla Firefox only.
• Install Greasemonkey add-on for Firefox (if you haven’t)
• Install the remove Orkut ads script

Why Orkut is showing ads ?

The Official Orkut blog explains that in this post as

One of the great things about social networks is their ability to supply you with information that’s relevant to you….On the Orkut team, we believe that advertisements should be no different

So the Orkut team thinks that these ads may provide additional information relevant to you.

But that might not be the only reason. There were rumors that Google might be shutting down Orkut. Running Orkut is a very expensive task for Google and they might want to earn at least some part of the expenses through these ads.

In fact they have created a micro site for advertising on Orkut that says Orkut is the best way to reach Indians online.