According to Twitter co-founder Biz Stone, who spoke at the Aspen Ideas Festival recently, Twitter is handling 800 million search queries per day.
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.