Technology firm Yahoo has appointed leading Google executive Marissa Mayer as its next chief executive.

Ms Mayer, 37, will become the firm's third CEO in the space of a year.

In a statement released by Yahoo, Ms Mayer said she was "honoured and delighted" to lead the company.

In May CEO Scott Thompson stepped down after accusations that he put a fake computer degree on his CV. In September 2011, CEO Carol Bartz was fired after two-and-a-half years in the post.