Nowadays the best way to stay in contact with a business professional, no matter which field they are in, is to set-up a LinkedIn account and ask to make a connection. If you are not familiar with LinkedIn, it's basically Facebook but for working professionals. You don't post personal or inappropriate topics or ask to "friend" someone. Instead, you post or discuss items that are related to your education or career and you "connect" with other professionals as a way to network.
Both connections and experience are important but sometimes it's who you know and not what you know. This means that to get your foot in the door at a company you need to know someone who works there to get your resume in the right hands for an interview. That's why it's important to establish as many contacts in your chosen filed as possible.
Once you have a contact list you can start interacting with them by posting interesting articles to your page or monitoring their posts and commenting every now and then. You can even keep everyone up to date with projects you're working on at school and any awards you've received. The important thing is to be remain active on LinkedIn to gain more exposure.