Partica: I think there are extremes at both ends of the spectum on this subject:
I have seen people who,lacking a "real life on or off line" of there own,"stalk" people online.this of course is creepy & isnt right.
having had a real stalker girl on & off line where I used to work,I know it is no joke.
at the other end of the spectrum,some people are paranoid & almost anti -social & rude in response to any one they dont know inviting them to a game.this to is creepy.
the site should incourage but not inhibit people's ability to socialize & promote a good community feeling.but also,it should not be used by people solely to "matchmake".
were to draw the line,or how to do so is a complex question.
fortunately,here at brainking,I have not experienced much of those at either end of the spectrum.exept once,a long time ago,when a newbie.I invited someone to play & was immediately blocked without explanation..fine..life goes on...lol.