In the age of Google Instant, where we expect search results to complete themselves before were done typing, Twitters search feature has long seemed a little slow and dumb. Cant it guess at what search term or person youre looking for? Cant it autocorrect your spelling? Cant it just search among the tweets of people you follow? Well, now you can do all of that, in theory. The microblogging service took the wraps off a new smarter search product Friday, after teasing us late Thursday with a brief announcement that search and discovery on Twitter was about to change forever.