EXCUSE THE PUN
People often wonder if Social Media will help their writing. What does that mean? Making a quick post on Facebook probably won't do much to improve your writing. However, a format that limits your wordiness may be of benefit. Instead of saying someone was really mad, you can trim it up by saying they were enraged. Yeah, it's only one word, but you get the idea.
Others use Social Media as a method of promoting their writing. Can this be done? Is it right for you? If you're self-published, you may employ Social-Media to hawk your talent. However, be wary NOT to fall into the trap of "hanging out" with other writers instead of readers. Writing groups are fine and you may even find tips to improve your writing. However, it's imperative that you make progress into something besides being just a paper tiger. Promotional groups or reading groups are what you need. Otherwise, you may end up getting dozens of "likes" on a post but not making any sales.