Twitter has a lot, a lot, of content and finding old tweets can often not be a fun task. Google just made that a bit easier with Google's Twitter Archive Search. The best description of it is to just play with it, try it by clicking here.
Here is a screen shot that shows the tweets for the keyword [earthquake] over time, with a timeline:
Also, Google placed Twitter's logo at the bottom of the search results - something I don't remember seeing on Google before. It reminds me of when Google powered Yahoo Search and we saw a logo that read, "Powered by Google".
A WebmasterWorldthread has some comments on this, including one that I really don't get:
yikes, public chat that can be archive and saved forever.
These are public tweets, you or I can read any public tweet and store it in a database. If you do not want something you say to be saved forever, then don't tweet it publicly. Yea, I know, you may want to delete old tweets, but still, someone, somewhere may have a record of it.
Forum discussion at WebmasterWorld.