By the time Foursquare realized they were becoming irrelevant, it was too late.

FORBES: Is Foursquare's Bubble About To Burst?

Less than a month after photo social network Instagram caught huge flak over advertiser-friendly changes to its privacy policy (and claimed it was misunderstood), another social network, the location check-in service Foursquare, has announced revenue-friendly changes to its privacy policy.

FORBES: Foursquare Checks In To Real Names And Sticks A Big Fork Into Pseudonymity

How was foursquare first described by its founders, and how do they describe it now?

FORBES: What Is Foursquare's Process For Creating, Maintaining And Hacking Away At Their Product Roadmap?

So for example, the Foursquare heart button on the app could publish back to Facebook that a Foursquare post was liked, if the person gives Facebook permission to publish it back.

FORBES: Facebook Makes Mobile Apps Like-able

Foursquare had to do something, but maneuver marketing is all about speed and it was too little too late.

FORBES: Is Foursquare's Bubble About To Burst?