To understand techno-optimism, it’s useful to look at the free software movement, whose ideology and activism gave rise to the GNU/Linux operating system, the Android mobile operating system, the Firefox and Chrome browsers, the BSD Unix that lives underneath Mac OS X, the Apache web-server and many other web- and e-mail-servers and innumerable other technologies. Free software is technology that is intended to be understood, modified, improved, and distributed by its users.
Also about the threat that centralized social networks produce:
As a techno-optimist, I was heartened to see the role that networked technologies played in aiding activists in Iran, Egypt, Libya, Bahrain and other middle-eastern autocracies to coordinate with one another. But as a techno-pessimist, I was horrified to see activists making use of unsecured unfit systems like Facebook, which make it trivial for authorities to snoop on and unpick the structure of activist organizations.