Social Networking is
vital in self promotion and it is also free advertising! Twitter is seen by millions of users each day and using the right #hashtags can definitely bring more viewers or even more clients in! Twitter is great in that it can be searched, so if someone searches for the term
Virtual Assistant (or something along those lines) and your post comes up among the others --
AND STANDS OUT, you may get a client.
Facebook is important too since Facebook is the virtual form of "Word Of Mouth". Once you "Like" something, it goes onto your wall for others to see. Basically, by liking, you just recommended that Facebook page, site, company, etc... to everyone on your friends list.
They are VERY important.

I did write this short blurb on
Why do Businesses Need Social Media. It isn't long,but it's very
to the point.