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U can check online courses on YouTube & Marketing Sites.
Attend free webinars by www.socialmediatoday.com
I recommedn Lynda.com but i don't know where can you find it for free
Social Meidia is an Art !!! Practice it well, on other hand you can study self pace on On Line leading website's (will cost you around $30 per month), some of examples are:
a. Lynda.com
b. udemy.com
Best of Luck
You can expand your own social media like linkedin, FB and other Social media. But to learn the Marketing you need to take a proper course and you should pay for it. Cause even if you learn it for free you are not going to provide a free service to your clients aren't you? So my friend if you really want to learn something and take that as a profession then you should learn from a good institute and you should have to pay for it as well.
You can try out the Constant Contact blog.I found it to be extremely helpful.