My website was flooded with new users. I got in 24 hours about 200 new users and I used to have only a couple of new users every week.
By default any new user has subscriber role (subscribe plugin enabled). I also enabled, when I first sow the sudden increase, captcha on comments for logged-in users, and comments are subject to approval for all kinf of users.
I would like to understand what could trigger this sudden increase of users. At some point someone sent me an email requesting permision to post "high quality articles" on my blog. I replied that I am interested, who wouldn't be, and inform them on the terms. I was to approve any submited articles and make sure they are originals and not copies of other articles on Internet. I asked the person to register and once that done I was to change their role to contributor. This might have triggered the flood of new users.
I have reCaptcha enabled, Akismet enabled and Bad Behaviour enabled and I could see in my log that I had a lot of filtered hits. When I realized that the flood will not stop I just disabled the registration. These new users seem like spammers, do they realy took their time to register? They have a Captcha to pass and email to check and confirm the registration. There seems to be a lot of direct hits on /wp-cron.php?doing_wp_cron. Is this normal?
If anyone has any clue what happened and how could this be avoided, please help. Any suggestion is good.
PS: I use WassUp as log viewer. and my website is: Dorian's Blog for Internet Businesses