Need More Information About Twitter and LinkedIn

I’m not all that technically-inclined, if that is the right word for it, so I am not getting the point of Twitter. Bonnie from Autism Family Adventures had recently asked me if I am following Twitter and to answer her, yes, I have a login account and have registered. I know she has plenty of followers, but I’m not clear on what is the point if I already have a blog. If someone can email me or comment on what they like about Twitter or why it’s great for them, I would love to know.

And LinkedIn for that matter. Anyone a member of that? If so, how does it work and what does it do to help you?

Thanks for your help from your not so technical or linked friend.