Some months ago I wondered whether captchas -- those annoying word-image verification systems that so many blogs use -- are really necessary. Well, now I know.
One of my recent, and rather widely linked, posts has attracted a huge amount of automated spam, linking to what seems to be a nasty spyware-purveying site. I have deleted perhaps 10 copies so far, but more keep coming in.
So, hello captchas, sorry commenters.
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2 comments:
well I being a 0 techie, read this one avidly. Liked the conciseness and the content...keep up the good work...
Hi Rahul
Got here through Nanopolitan.
You should probably watch the talk of the Captcha co-inventor - Louis Von Ahn.
http://video.google.com/videoplay?docid=-8246463980976635143&q=luis+von+ahn&pr=goog-sl
His homepage you will find other 'games' he has designed to harness human computation power.
http://www.cs.cmu.edu/~biglou/
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