Social media research is invaluable for a complete piece of the business information puzzle. Mashable is the go to resouurce for the top social media news on topics like Facebook, YouTube, Gmail, Twitter, Amazon, Pinterest and more.
Although social media sources are in real time, information found on these resources is not authoratative, but should be considered in making decisions.
Twitter is a great tool for communication. Not only is it an essential part of many companies' social media plans, but it is also a great way for students to network with professionals in their chosen fields.
LinkedIn - Great for networking, job searches, and collaboration.