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Twitter on Monday announced that Dick Costolo has become its chief executive officer (CEO), replacing Evan Williams, co-founder of the micro-blogging service.

Costolo, a Google veteran who joined Twitter last year as its chief operating officer (COO), took over the new role of CEO effective immediately.

During his year at Twitter, Costolo "has been a critical leader in devising and executing our revenue efforts, while simultaneously and effectively making the trains run on time in the office," Williams said in a post on Twitter's blog announcing the hand-over of the reigns.

"Starting today, I'll be completely focused on product strategy, " said Williams, who co-founded Twitter in 2006 with Jack Dorsey and Biz Stone.

Twitter, which allows users to post status updates with a 140- character limits, has witnessed repaid growth in user base since its launch.

Williams said there are 300 people now working at Twitter, compared to about 20 when he took the CEO job two years ago.

"Back then, people were creating about 1.25 million tweets a day -- compared to 90 million today. In those same two years, we grew from 3 million registered users to more than 165 million today," he noted.

Shreya Saran at South Scope Cine Awards

Shreya Saran at South Scope Cine Awards VIEW SLIDE SHOW DOWNLOAD ALL

Big Boss season 4 Participants
Big Boss season 4 is finally on air. This established reality show kick started on the channel Colors last night i.e. Sunday.
The host of this TV show, Salman Khan received all the fourteen contestants amidst much fanfare in his trademark bindass style.
These are the fourteen contestants who are slated to be a part of this season 4:
Aanchal Kumar: Aanchal works as a model but it was her alleged relationship with cricketer Yuvraj Singh that got her a place in this show.
Abbas Azmi: Abbas works as a lawyer. He earned fame after he fought the case of Ajmal Kasab, the key-accused in the Mumbai attacks.
Ashmit Patel: He is an actor by profession and the sibling of actress Amisha Patel.
Begum Nawazish Ali: This is an alias name taken by Ali Saleem who is the host as well as a scriptwriter of a well-known talk show in Pakistan.
Bunty chor: The infamous thief who is rumored to have more than 500 cases running on him and is considered the inspiration behind the movie Oye Lucky Lucky Oye.
Hrishant Goswami: He works as a model and won the Gladrags Manhunt 2004.
Manoj Tiwari: He acts in Bhojpuri movies.
Rahul Bhatt: The hot handsome hunk son of the Bollywood film maker Mahesh Bhatt.
Sakshi Pradhan: Sakshi won the MTV reality show, SplitsVilla season 2. She got into a controversy due to an alleged MMS.
Sameer Soni: Sameer is a well-known TV actor and an established model. He also made it big by plating the role of a gay designer in the Bollywood blockbuster Fashion.
Sara Khan: Sara is the beautiful and shy TV actress.
Seema Parihar: Seema is a dacoit who was in the Beehar area of Chambal for around 18 years. There are many cases against her still running in the court.
Shweta Tiwari: Shweta is a well-known TV actress who has recently separated from her husband, Raja Choudhary.
Veena Malik: Veena is a Pakistani model and former girlfriend of Pakistani cricketer Mohammed Asif. She was in the news recently during the Pakistani spot fixing scandal.