The answer to that question may be 'a lot', and some of what they find could affect your employment prospects. Have you 'Googled' yourself lately? Employers and recruiters are using this method regularly now to find out more about job applicants to decide whether or not to interview them.
Here at the RSC Careers Service we recommend that you have an online presence to raise your profile and find out about new contacts and opportunities - it's essential in the current climate. But make sure you manage your online reputation carefully. I found a good
post about this on the University of Warwick's Careers blog. It's well worth a look.
My colleague Laura has written a great
article on using LinkedIn effectively too, which will help you to look good online.
If you haven't 'googled' yourself lately, try now - you could be surprised at what you find. That photo of you on holiday in a Hawaiian shirt dancing on the table should really be behind a privacy wall for friends and family only!