It appears that the cause of this issue is the URL crawler timing out when requesting your site. For example:
time curl -I http://www.conversocial.com/blog/entry/stop-upsetting-your-customers-a-start-getting-local
HTTP/1.1 200 OK
Server: Apache/2.2.17 (Unix) PHP/5.3.5 mod_wsgi/3.3 Python/2.6.2
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Content-Type: text/html; charset=utf-8
Date: Tue, 01 Nov 2011 01:06:24 GMT
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Pragma: no-cache
Transfer-Encoding: chunked
Connection: Keep-Alive
Set-Cookie: symfony=1v4lan2fcs79qo45nt22svqft4; path=/
X-Powered-By: PHP/5.3.5
real 0m6.194s
user 0m0.005s
sys 0m0.008s
Every request I’ve issued seems to take over 5 seconds. Reducing the latency of your site (at least for HEAD requests) should help fix this, although we are working on fixing this on our end as well.