Tweeting?

I just read that Ricky Martin has over three million followers of his tweets, Steve Martin over five million. It's hard to believe that many people are into this but for celebs, it's obviously gold.  I neglected a twitter account  that some very good people set up for me when my book's web page was created - my webmaster designer and my wonderful daughter - and was surprised to find that I am following people [ten] and being followed  by, well, eight people, two of whom are related to me :).   Now I just need to work on following and getting followed by like-minded folks and understanding the medium and something about "plug-ins" where the blog [this one], twitter and facebook are all together. Yikes - would anyone really be interested in that much info? TMI, methinks but I have to give it a whirl if I want to promote this novel at all, yes?  And then I've heard something about "hashtags"...So much to learn - wish I were twenty again so I could absorb all this easily!  But it doesn't hurt anyone to dive on in and see what some of this produces.