I don't see gamers having less friends than non-gamers at all. In fact, it might cause them to make some more due to having a sort of connection or having common ground with other people also involved with video games.
We rest Do Video Gamers Have Fewer Friends? to share scoop from past years:
Today is: 18th June (GMT), in history on the 18th of June, 1858 AD the following birth happened:
Hans Schardt: Switzerland -- Geologist