Joost de Valk posted some scary stuff over on his Yoast blog this weekend. In short, an SEO plugin used on WordPress was not really an SEO plugin. It was pure spam and malware. Bloggers who installed it virtually handed over their sites to this plugin and it resulted in a huge mess for them and the internet. Joost de Valk reviews plugins for WordPress, but when he saw “BlogPress SEO” he was a …