Given a reference text about twitter, how many accounts were estimated to be fake?

Twitter was created by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams in March 2006 and launched in July of that year. Twitter, Inc. is based in San Francisco, California and has more than 25 offices around the world.[10] By 2012, more than 100 million users tweeted 340 million tweets a day,[11] and the service handled an average of 1.6 billion search queries per day.[12][13][11] In 2013, it was one of the ten most-visited websites and has been described as "the SMS of the Internet".[14] By the start of 2019, Twitter had more than 330 million monthly active users.[15] In practice, the vast majority of tweets are tweeted by a minority of users.[16][17] In 2020, it was estimated that approximately 48 million accounts (15% of all accounts) were fake.[18]

In 2020, about 48 million accounts were estimated to be fake.