Just glancing at the front page, the SFW boards on 4chan outnumber the NSFW (18+) boards. Of the top 4 boards in terms of 4chan's traffic, only two are in the 18+ category.
/b/ (the very NSFW board responsible for 4chan's notorious infamy) accounts for 30% of 4ch's traffic but the next two most popular boards /v/ (video games) and /a/ (anime and manga) are both SFW. Not that I would recommend anyone to lurk 4chan at work.
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Just glancing at the front page, the SFW boards on 4chan outnumber the NSFW (18+) boards. Of the top 4 boards in terms of 4chan's traffic, only two are in the 18+ category.
/b/ (the very NSFW board responsible for 4chan's notorious infamy) accounts for 30% of 4ch's traffic but the next two most popular boards /v/ (video games) and /a/ (anime and manga) are both SFW. Not that I would recommend anyone to lurk 4chan at work.
The traffic and popularity figures I mention are on Wikipedia with citations: http://en.wikipedia.org/wiki/4chan
In practice, the "SFW" standards on 4chan are quite lax. Case in point: /g/ (the technology board) and /v/ (the video games board).
I'd think twice before browsing either of those boards at work.
I don't doubt that, but I never see links to the SFW boards. I almost exclusively read or get sent links to /b/.
Why would anyone ever send someone a link to /b/? Threads last half an hour, tops. By the time the person sees the link, the thread has likely 404'd.
IM, not email.
Edit: Apologies, my bad. Misread.
I think you misread, nobody was suggesting to lurk 4chan at work, in fact the exact opposite.