User:Ans/spam


 * googlegroups
 * many spam come from gmail account
 * creating gmail account require captcha
 * registering googlegroups with non-gmail account require captcha
 * subscribe via email using non-gmail account not require captcha
 * subscribing to any groups via google account, should also require captcha, to prevent subscribing to many groups via bot
 * uploading image or any content to the groups, should also require captcha