Aarresaari network is an effective tool for targeting your job and trainee advertisements or thesis topic proposals at university students or recent graduates. With one announcement, you get access to channels of 13 universities. You can choose whether to target your advertisements to specific or all universities. The service is actively used by LUT University and University of Helsinki among others.
You can also target students by their fields of education – remember international university degree students also.
Aarresaari is a free service run by universities.
Check out the service here