There are plenty of people on Facebook and Twitter claiming to know how to
teach someone to write. I avoid them like the plague because you can't
teach someone to write, and those people are always selling something that no one needs to pay for. Grammar and punctuation basics are available for free all over the Internet. All you have to do is Google it, find a site you like, and read. Then apply it when you write. As for the rest, you either have the passion and the drive to write, or you don't. You can't teach that to people. It comes from within them. They're born with it.
The Internet has made it too easy for literally anyone to upload a book and call themselves an "author." The hard part is in selling those books because there are now so many of us that the market is flooded, and there are too few gatekeepers left. That is both good and bad, because now, anyone can self-publish a book. Doesn't mean they're all bad books. Not at all. But it makes it very hard for those of us trying to make a living doing this.
Facebook and Twitter have their good points, but they are also the two most widely-used social media platforms for all those tens of thousands of aforementioned self-pubbed authors. I tend to avoid authors who do nothing more than spam everyone with promo all day long, and unfortunately, they come out of the woodwork by the dozens every week. I can't count all the friend requests I get from those simply looking to gather authors as FB friends so they can slam them with promo. Same with Twitter. I get followers all the time who do nothing but tweet promo, or tweet their "author marketing" crap all day long. When I get ambitious, I go through and block all of them, but that's a time suck, too.
If the first thing someone does after friending me on FB or following me on Twitter is to post a BUY MY BOOKS!! (complete with links) post or tweet to me, they're unfriended/unfollowed and blocked. It's SOCIAL media, not PROMO media, and so many authors do not understand that.
I have author friends I promote all the time, and I'm happy to do it. But we've built up a rapport over time. It's a mutual friendship/cyber thingy we have going. I like them as people first, authors second. Many of them I've met in real life. Many others live too far away, but I sure do hope I can meet them one day.
I have a small (relatively speaking) but very loyal following of readers because I TALK to them, I don't just toss promo at them. I know their pets' names, their husbands' names, and what they like to watch on TV. And they in turn know as much about me as any real life friend would know. And for me, that's the biggest advantage to FB. It lets me talk to people all over the world, and get to know them on a human level. That approach might never make me rich and famous, but I have steady sales because of it, and when I draw in new readers, it's because my loyal ones have spread the word, not because I had to pay anyone to do it for me. And no one - reader or author alike - has ever accused me of being a promo whore.
FB and Twitter can work well for you if you use them as ways to connect on a human level with others, not merely as a vehicle to flog your books.
I found you easily enough on Twitter though. 
