So many blog sites

So here I am not having written here for around 8 months wondering whether I should look at another of the many free blog sites available. tumblr looks interesting. But it makes me wonder as to why there are so many of these....

Surely the inline adverts can't make Google et al that much money? Maybe they do.

Or maybe they're trying to tempt us onto 'premium services' (are there any for blogger?)

Or are they just here providing a 'service' to the internet community... yeah of course!