Following Facebook’s lead, Linkedin announced on Monday that it was ready to open up its platform to outside developers wanting to create apps. This announcement comes in well under the nine-month mark originally projected by founder and Chairman Reid Hoffman back in July

In our last post we began to at the four biggest social media sites there are today (Linkedin, Facebook, Twitter, and YouTube), and why you may (or may not) want to be on them. We covered Linkedin and its advantages in the professional world, and next we’re going to talk about Facebook.