What do you geek?

Our library along with the three libraries in the biggest cities of our country have started a new campaign to create more awareness about the library. We target people between 20 and 35, because they are least present among our members. First goal is awareness, ultimate goal is more members.

The campaign is a copy-paste from similar campaigns in the USA and Germany, that have proved successful. I am not exactly sure what the campaign enhances, time will tell. "I geek ...." is a first step. If someone answers for instance "Well, I geek trains", then we're supposed to tell the library has lots of info about trains.

What do you geek?