The access growth rate is expected to slow to 8.1 percent this year, down from 8.6 percent in 2014. Until 2012, growth rates had been in double digits for years.
"We have reached a transition point in the growth of the Internet," the report said.
The commission, set up in 2010 by the International Telecommunication Union and UNESCO, the U.N. scientific and cultural agency, said the milestone of four billion Internet users was unlikely to be passed before 2020.
It said growth in Facebook subscribers was outpacing growth in the Internet.
"Over half the world`s population -- some 57 percent, or more than 4 billion people -- still do not use the Internet regularly or actively," the report said. It blamed the cost of extending last-mile infrastructure to rural and remote customers, and a sharp slowdown in the growth of mobile cellular subscriptions globally.
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