WDMFJT is a simple Twitter based mash-up that creates a scrollable timeline with information about when your various friends may have joined Twitter. The app doesn’t require authentication and you may therefore use it to research the connections of any other Twitter user as well.

The lower half of the timeline represents the month while the upper half represents the actual date when your friend jumped into the Twitter bandwagon.

Twitter internally launched around this time some five years ago – see the first tweet written by Twitter co-founder Jack Dorsey – but it was only an year later (March 2007 to be precise) when the tech influencers started flocking Twitter.

WDMFJT is a work of @vsr who previously created Tweetbook, another useful app that lets you download your tweets as a well-formatted PDF book.