Twitter chief executive Dick Costolo has dismissed talk of a $10bn deal with Google as "rumour" during a keynote speech at Mobile World Congress.
He laughed off questions about tie-ups with Facebook and Google, saying he didn't know "where such talk came from".
Instead he concentrated on the importance of the service's growth, especially on mobile.
According to Mr Costolo, 40% of tweets now come from mobile platforms.
He said that the service needed "deeper integration" in smartphones as well as to extend how it was made available to more basic phones.
