How to Install a Tool to Stop Bot Spammers in Elgg | Arvixe Blog: "among Elgg users, and it is a big problem in our servers. Bot spammers take bandwidth, and reduce loading speed of your elgg site because usually those spammers flood it with thousand of spams.
The tool that we are going to use is called Math Captcha. What it does is ask users a math question before signing up to your elgg site. You can download it from here. It is free and it is compatible with the latest version of Elgg."
'via Blog this'
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