spam-prevention
Spam Prevention/Reduction – Contact Form?
A very simple trick I’ve been using with a surprisingly good success rate is this: Provide a text field that is hidden from human users with style=”display: none”, but with an enticing name like email. Most bots will fill in something in this field, but humans can’t see it so they wont. At the server, … Read more
Protect e-mail address with CSS only
It’s very simple. You can protect your email address with only HTML & CSS. You don’t need to know about PHP or Java script. Try below code. Simple HTML and CSS code: <!doctype html> <html> <head> <title>Protect e-mail with only css</title> <style type=”text/css”> .e-mail:before { content: attr(data-website) “\0040” attr(data-user); unicode-bidi: bidi-override; direction: rtl; } </style> … Read more
Detecting a (naughty or nice) URL or link in a text string
I’m concentrating my answer on trying to avoid spammers. This leads to two sub-assumptions: the people using the system will therefore be actively trying to contravene your check and your goal is only to detect the presence of a URL, not to extract the complete URL. This solution would look different if your goal is … Read more
Publicly Available Spam Filter Training Set [closed]
Here is what I was looking for: http://untroubled.org/spam/ This archive has around a gigabyte of compressed accumulated spam messages dating 1998 – 2011. Now I just need to get non-spam email. So I’ll just query my own Gmail for that using the getmail program and the tutorial at mattcutts.com
Hunting cheaters in a voting competition
Direct feedback elimination This is more of a general strategy that can be combined with many of the other methods. Don’t let the spammer know if he succeeds. You can either hide the current results altogether, only show percentages without absolute number of votes or delay the display of the votes. Pro: good against all … Read more
Better Honeypot Implementation (Form Anti-Spam)
Concept By adding a invisible field to your forms that only spambots can see, you can trick them into revealing that they are spambots and not actual end-users. HTML <input type=”checkbox” name=”contact_me_by_fax_only” value=”1″ style=”display:none !important” tabindex=”-1″ autocomplete=”off”> Here we have a simple checkbox that: Is hidden with CSS. Has an obscure but obviously fake name. … Read more
What is the best way to programmatically detect porn images? [closed]
This is actually reasonably easy. You can programatically detect skin tones – and porn images tend to have a lot of skin. This will create false positives but if this is a problem you can pass images so detected through actual moderation. This not only greatly reduces the the work for moderators but also gives … Read more