Re: Links Problem in header
You might like to get some anti bot plugins from wordpress. I have WordPress MU and Buddypress and use the following plugins to prevent bots from joining my site.
WP-SpamFree – An extremely powerful anti-spam plugin that virtually eliminates comment spam. Finally, you can enjoy a spam-free WordPress blog! Includes spam-free contact form feature as well. http://www.polepositionmarketing.com/library/wp-spamfree/
WPMU Super Captcha – Custom captcha program made to stop spam bots cold in their tracks. Features audio, word files, or random text. You configure it! https://wordpress.org/extend/plugins/super-capcha/
Or go to http://www.wordpress.org, click on extend and find them there.