At Twitter's Chirp conference in April, Stone said Twitter was serving 600 million search queries per day — 33% less than the microblogging service is processing now.
The number reminds us of Bing's impressive growth last year, when Nielsen reported that Microsoft's search engine was growing 22.1% month-over-month. However, Bing was unable to continue growing at that rate; it lost 5% of its stake in the search market the very next month.
All this time, Twitter's search has been growing; partly due to Twitter's growth in use and users, and partly because Twitter's real-time search is one of the best ways to find out what's happening right now. With the recent launch of Twitter's ad platform, a huge search volume will definitely help Twitter increase its revenue stream.