According to Twitter statistics, the average number of tweets daily is a little less than 2 million, updated by around 630,000 unique Twitter users.
The idea of having a real time search is possible through the Twitter search engine, found at http://search.twitter.com. When a user search for a given topic, the results page shows what is been tweeted about that issue in real time.
The “Trending Topics” shown in the home page reflects the 10 most tweeted topics in real time. They are refreshed every 5 to 11 minutes.
But, the million dollar question is: How many tweets are needed to trend on Twitter?
It actually varies according to the time of the day. As mentioned above, a trending topic is refreshed periodically. So, to figure at the top ten, the topic must be tweeted in a short period of time. It is necessary around 1200 tweets from 12am to 6am PDT to reach the top 10. From 6am to 12pm PDT, 1700 tweets. From 12pm to 6pm PDT, 1500 tweets. And 1900 tweets from 6pm to midnight PDT.
The number of unique users tweeting also plays an important role in the equation, it ranges from 600 to 900 users.
Lately we have seen some movements to make a topic trend, as I mentioned in this blog on July 14th, when Brazilians mobilized to have the Jonas Brothers back for a new tour, posting hundreds of updates with the tag #BrazilwantsJB. Check it at http://pl0.sl.pt.
As a marketer, update an interesting message and hope that some 900 of your followers retweet it at least twice or, better yet, 1800 followers retweet it once. The reward: 5 to 10 minutes trending on Twitter, viewed by millions of users. Good luck!