Did Retweet fail to get the sense of Twitter by not providing any commentary that users might like to add? Is that true?
It took me a while to understand what Retweet was, though not so long, after using it 3 times I I got the idea and find it much more creative than the Tweet button itself.

Besides, you can see comments by other people who retweet and see who is sharing your ideas, knowledge and interests.
Actually, the problem of Twitter itself and the reason why it launched the List application, which is really rough to be honest, is to enable people to interact in a more organised way.
Otherwise it is going to be a sort of list of micro-news which you can get as though you were gambling to get them.

My personal opinion and question is: why does Twitter not evolve its search engine by developing an advanced search?
In that case I would see Twitter as the leader in micro-blogging news.

What would you like to find in an advanced search for Twitter?