MIT Social Media Hub
If you want a snapshot into what all of the different MIT communities/offices/labs/important people/etc are posting, the MIT Social Media Hub is your spot. The Hub shares everything MIT, from the latest research and news to the craziest hacks and campus events.
The MIT Division of Student Life hosts several social media accounts that are run entirely by weekly undergraduate student takeovers. You can follow @MITStudents on Facebook, Twitter, Instagram, Tumblr, and Snapchat.