I Don't Get It

I was on Twitter just now and noticed I've got 44 people following me, many of whom I have no idea who they are or why.

One that I checked on is following, brace yourself, 57,000 people. I don't get how or why they would be interested in a twitter stream with that many people.

Can someone explain what's going on? And yes, they appear to be a real person, a rather cute German girl from her picture.