Some time ago there was a guest book service that suddenly changed the system so paid, but many blogs are using the guest book, even I also use it dolo. Forced to eventually have to find another service that simple guest book and interesting.
Here is a sample provider site guestbook / free chat is quite easy and interesting:
cbox
http://www.cbox.ws/
FIBOX
http://www.fibox.ws/
shoutbox
http://shoutbox.widget.me/
shoutmix
http://www.shoutmix.com/v3/
Userplane
http://www.userplane.com/
Chatango
http://www.chatango.com/
php freechat
http://www.phpfreechat.net/
Envolve
https://www.envolve.com/
jw chat
http://blog.jwchat.org/jwchat/
Parachat
http://www.parachat.com/demo/
Plugoo
http://www.plugoo.com/
99chats
http://www.99chats.com/
Mibbit
http://www.mibbit.com/
Good luck. Thank you :)
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