[wasanbes]

You got it right. My idea isn't a simple twitter-like service. It was also important to make changes that make my service fit with the web 2.0 hype.

[babul]

Twitter is not simple service and faced many unique problems much discussed already here and on the web in general.

Also you should not be basing your offering on what the current hype is, but rather on filling a need and offering something people want and will use. When the hype fades, atleast then you will (hopefully) have something of value that will last beyond it.