We looking for interns to work with us (yumety) ( machine learning, supervised algorithm ) - anyone knows how to contact interns?
The career office of your local college is a good place to start.
Also, consider startup networks like http://www.onedayonejob.com/ or http://startuply.com/ or local meetup chapters, for example http://jobs.nytm.org/
I'm assuming you need CS majors. I'm in the same boat and this is what I'll be doing. I'd therefore recommend doing the same.
All the best!
We've had good success clearly advertising internships on Craigslist.