Caio Túlio was one of the founders of UOL, Latin America’s largest internet portal, and is an Internet pioneer in Brazil, expert in digital media, journalist, teacher of journalism and Ph.D. in Communication by the University of São Paulo, Brasil.

As a teacher at the School of Advertising and Marketing, in São Paulo, Costa was Visiting Research Fellow at Columbia University Graduate School of Journalism in Nueva York during the autumn of 2013.

At Columbia University, Costa conducted a research to map the possible business models for the communication industry in the digital age. Costa wrote a report about the research: "A Business Model for Digital Journalism: How Newspapers Should Embrace Technology, Social and Value Added Services".

Costa is also a partner of Torabit Tecnologia, a digital monitoring platform and was director of digital strategy for ANJ, National Association of Newspapers.

He also joined the board of directors of Fundación Padre Anchieta (TV Cultura) and is on the editorial board of the Pesquisa FAPESP Magazine and Revista de Jornalismo ESPM.

He worked for 21 years for the Folha de S. Paulo journal, where he was editor, managing editor, correspondent in Paris (France) and creator of Revista da Folha (published with the periodical). He was also chosen to be the first ombudsman for the Brazilian press.

Withim the same communication group, Costa was one of the founders in 1996 of Universo Online, UOL, the first major portal and Internet provider in Latin America, who was the general director during the first several years.

In 2006, he joined the presidency of the Internet Group, the Internet arm of Brasil Telecom, a big Brazilian telco, consolidating the portals and internet service provides iG, iBest and BrTurbo. In 2009 he gave consultancy to Oi (Brazilian telecommunications company) on the digital platform of convergent media.

He is the author and organizer of several books of communication and history, among them "Ethics, journalism and new media: a provisional moral" (Zahar).