If you do not have a blog, START ONE! I have been searching for students to do some fun, innovative and interesting social media work, but as for students who blog... they are far and inbetween. If I can't find you online, you might as well not even exist. Cruel maybe, but today marketing and communications exists online, so if your not playing, you can't be on the team.
Seriously, in this day of quick and easy self publishing, why wouldn't you jump in? It is simple really. You don't need to be profound (although I am sure it would help if you are), but you do need to take enough initiative to learn and engage with social forms of media - as it is the reality of today's media landscape and will help you understand where we are today and where all this is headed in the future.
Sign up for del.icio.us, to tag and share articles you find interesting. Sign up for flickr and post pictures of your small dorm room, your campus, your marketing class, your cat... whatever. Sign up for twitter, make and effort to post a few times a day and follow other people you find interesting, engage and link to sites or news. Sign up for digg and start digging new you like and bury news you think sucks.
Then go to Wordpress and sign up for a free blog. Talk about your experiences in these social communities, link to these profiles you created in your sidebar with widgets and blog posts with outgoing links. Make yourself searchable. When you type your name into Google, what comes up? Nothing? Then you've got some work to do.