[pharke]

Less so now but the whole site used to be a filter bubble of people in tech/science or with tech/science interests. It was actually a fairly positive filter though since it resulted in some very interesting content being surfaced. It still stands head and shoulders above the rest but there has certainly been some decline in recent years. In its early days, Reddit was much the same but suffered a massive decline after becoming the "front page of the internet". All "free as in beer" communities seem to follow a similar progression, those with stronger gatekeeping tend to last longer but no site can survive an overwhelming influx of new users without a proportionate increase in the ability to educate those users in the norms of the group they are joining.