Do I need a blog?

Do I need a blog?
What should I write about?
Which language should I write in anyway?

Questions that I can't really answer for sure but I can say that I've been thinking about starting a new blog for a while now. I've been reading so many blogs every day and I felt it would be nice to share stuff of my own.

I have no idea if anybody will ever read it, I only have a faint idea what I want to write about, but I guess I'll just have to write and see.

And for the third question - I guess it will be in English. It's good practice and it feels more open for potential readers ;-)