Arulkumarasan re-activated the application on Tuesday afternoon, after tweaking it to make it less costly to run by using HTML instead of Flash. It may have some bugs, but he expects those to be ironed out within 24 hours.

"Facebook has never asked me to take the application down," Arulkumarasan said.

He also defended the notifications generated from the application and said they comply with Facebook's guidelines.

FanCheck users can tag friends in their "fan" list, so that a thumbnail image of the screenshot gets posted to their tagged friends' profiles along with a link inviting them to install the application. A thumbnail image is also broadcast to the friends of those tagged friends.

At first glance, this seems like the type of spammy and confusing application-notification method that Facebook has tried to eradicate. Not so, said Arulkumarasan.