Try Twitter for Job Openings
It may not cost the job seeker a penny to search for open positions on the big career web sites such as Monster but companies may pay lots of money to list them. Hence, job postings are appearing on Linkedin and also Twitter to save themselves money. Certainly, with Twitter its simple. All it takes is 140 characters of text.
You can learn about new openings by signing up with companies directly or you can access third-party services. For an example of a third-party serice, have a go at TwitterJobSearch and perhaps you will find some listing not posted anywhere else. You can also search for jobs by searching Twitter, of course. T0 investigate career opportunities more directly, try the career tab on a company web site and just look for the Twitter logo.