Older Tweets Now Showing In Twitter Search

Twitter announced they are now displaying older tweets, when relevant, in their search results.

Twitter said that the older tweets that show up in the search results represents a "fairly small percentage of total Tweets ever sent." They use engagement metrics such as "favorites, retweets and clicks" in their algorithms "to determine which Tweets to show."

For example, I searched for [space shuttle] in Twitter and this tweet from a while back showed up at top:

Is it relevant? That is the big challenge Twitter needs to solve.

Forum discussion at WebmasterWorld.