Both sites attracted 18 per cent more European surfers compared with the figures for August.
Wikipedia attracted 59.9 million European visitors in September, while YouTube recorded 27.4 million.
The other big winner was the education sector, as millions of children returned to school across Europe.
However, the sites all showed a flat performance with just a one per cent rise in traffic.
Google pulled in an audience of 160.8 billion, Microsoft 146.1 billion and Yahoo 100 billion, out of a possible 216.2 million European surfers aged 15 and above.
The figures in the study exclude traffic from public computers such as internet cafés or access from mobile phones and PDAs.
Molybdenum ditelluride is a two-dimensional material that can be easily stacked into multiple layers to create a memory cell
New light-guiding nanoscale device can control and monitor a nanoparticle trapped in a laser beam with high sensitivity
Optical traps are scientific instruments in which a focused laser beam is used to exert an attractive or repulsive force on a microscopic object to hold it in place
Scientists estimate that the exoplanet has already lost up to 35 per cent of its mass over its lifetime
The observations were made using the Atacama Array in the Chilean desert