WAP was supposed to make people money. People use mobile phones to talk to each other. Normally in close proximity to me on a bad day. Text messaging is huge. It was created as a novelty feature and has become probably the main function used on many phones.
People use it to talk to each other.
Blogger was started as a cool gimmick for the programmers who wrote it. They decided to give the service away for free and it became so successful they recently had to seriously upgrade their computers. It, and other similar services, have revolutionised non-corporate web sites by giving them the power to keep their content fresh with minimal hassle, allowing more time to communicate with other people. It also means when I come across something I disagree with I can make a case against it, and I suspect most people reading my rant will pay it more attention that if it was thrust at them by some content provider looking to make a buck. They'll pay attention because they came to this page to read what I have to say, and then, if they deem it worthy, they'll have a rant on their own site.