You can use WordPress to create a blog; it is available through Tufts:
To subscribe to RSS feeds, look for the orange icon.
You need an RSS reader, examples:
Essentially a blog limited to 140 characters. Use it to show what you are interested in. You can mix the professional, scholarly, and personal. You can follow anyone; you do not have to be "friends." Twitter can add to your professional profile.
TweetDeck - Twitter tool for tracking, organizing and engaging
How to get started on Twitter (from ProfHacker, Ryan Cordell)
Ten Tips for Tweeting at Conferences (from ProfHacker, Brian Croxall)