LinkedIn is a great tool to use in order to brand yourself professionally and network to find opportunities. You can also use LinkedIn to conduct informational interviews and look for jobs.
Connect with employers through LinkedIn and grow your professional online brand by joining groups with keywords of your interest. Follow companies you are interested in, while expanding your options as well and looking at not so known companies.
Once you are in groups, you can start connecting with members in the groups and view the companies for which they work. This will assist you in finding additional companies in the realm of your interest.