There's a lot of information out there on sourcing participants. It depends on the type of research you want to do, and the required quality/reporting of research outcomes.

A few methods:

• Adwords that drop people on a screening survey, which you use to qualify potential participants

• Facebook / Twitter etc.

• Casual word of mouth / Friends and family

• Sourcing firm or tool like ethn.io

• Traditional advertising like you did at your university

The art of finding people hasn't changed much over the years. Here's a few more that I recalled reading:

http://blogs.parc.com/blog/2014/05/9-ways-to-successfully-recruit-market-research-participants/