(on not knowing what specifically you want to work on) "If you are not sure, one good strategy is to rotate - tell one company you'd like to do frontend work, tell the next you'd like to work on mobile and tell the third company you'd like to work on big data. Next summer (or in your spare time) you can try out something different."

...so instead of you just randomly picking what subfield to slot a college hire into, you're asking them to pick randomly and lie about being interested in it?