Therefore, when a small audience recommended that you install the guest book. Fresh review of scripts and services on the Internet guest books, I could not find. So I had to go through trial and error, which made certain findings. For beginners and experienced webmaster I recommend a double solution - guest book service ModernSite (project started on site modernsite.km.ru in 2001), which is available free guestbook script MBook. Everyone chooses his own: novice webmasters enjoy the service of guest books, and advanced - set yourself a script. Also pleased that the service is constantly evolving, adding new features, resolved issues with spam. Overall - would recommend.
Similar service with open and free source I have not seen. On the other hand, among the 'advanced' professionals are of the opinion that the best guestbook script - this one that you wrote yourself. I hasten to refute this opinion. Enough to see a list of vulnerabilities, even in high-quality scripts, designed not novices to understand that it is not a simple matter - web programming. It is not enough just to write a working script. It is important to consider all the possibilities of its use to the hole in the script (for example, SQL-injection or XSS) the attacker is not given access to the database and the entire site. And to minimize the load provided by the script server. Otherwise, in a 'perfect' day Your hosting provider will ask (politely asks so) in connection with the increased load your scripts to move to a more expensive rate plan, or even on a dedicated server. So, my recommendations are - use a script developed by professionals. Fortunately, that there are many even in the free version.

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