HIGH CPU Usage with FB's Bots

Hello

I have huge issue since a few weeks now, i hav emy store down with error 500 like 5 times a days.. i looked at my log error, and i see each time it happens when FB's bot is scrowling the site... i got in touch with my host, and they slowed down the scrolling with 30 second per request in my HTACCESS.

But again i got this issue... here is the error i got:
[client 69.171.237.5] SoftException in Application.cpp:574: Could not execute script "/home/XXXX/public_html/store/index.php"
[Thu Oct 18 04:16:39 2012] [error] [client 69.171.237.5] File does not exist: /home/XXXX/public_html/500.shtml

Also i noticed i hav ethis line in this folder:
/store/includes/templates/MYTEMPLATE/common/html_header.php

I don't know what to do to solve this issue :( i spent many hours ecven upgraded the store, cuz i thought i had a malware, so i did a filecompare etc.. and again this issue, till i figure out it's from FB's BOt :(

any help is much appreciated!

You could look at adding Crawl-Delay to your robots.txt file for Faceboot bots, something like:

User-agent: facebookexternalhit/1.1 
Crawl-delay: 5

User-agent: facebookexternalhit/1.0 
Crawl-delay: 5

User-agent: facebookexternalhit/* 
Crawl-delay: 5

thank you!! going to try this or i will have to block Fb's bots :(