Also, there is an error for dropbox in the live log. This is a home UTM, using transparent proxy and the only category set to block is nudity.
Under "Always allow these sites" i have these two entries:
https?://[A-Za-z0-9.-]*facebook\.com
https?://[A-Za-z0-9.-]*fbcdn\.net
012:11:28-19:15:51 home-fw httpproxy[9134]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.12.50" dstip="69.171.234.39" user="" statuscode="500" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="0" request="0xb350bd80" url="www.facebook.com/.../TimelinePhotosAlbumPagelet
2012:11:28-19:16:28 home-fw httpproxy[9134]: id="0060" severity="info" sys="SecureWeb" sub="http" name="web request blocked, forbidden category detected" action="block" method="GET" srcip="192.168.12.50" dstip="" user="" statuscode="403" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="3257" request="0x9a69380" url="notify6.dropbox.com/subscribe
2012:11:28-19:16:29 home-fw httpproxy[9134]: id="0060" severity="info" sys="SecureWeb" sub="http" name="web request blocked, forbidden category detected" action="block" method="GET" srcip="192.168.12.50" dstip="" user="" statuscode="403" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="3257" request="0xb3601300" url="notify6.dropbox.com/subscribe
2012:11:28-19:17:29 home-fw httpproxy[9134]: id="0060" severity="info" sys="SecureWeb" sub="http" name="web request blocked, forbidden category detected" action="block" method="GET" srcip="192.168.12.50" dstip="" user="" statuscode="403" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="3257" request="0xb3207be0" url="notify6.dropbox.com/subscribe
2012:11:28-19:17:29 home-fw httpproxy[9134]: id="0060" severity="info" sys="SecureWeb" sub="http" name="web request blocked, forbidden category detected" action="block" method="GET" srcip="192.168.12.50" dstip="" user="" statuscode="403" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="3257" request="0x9a69960" url="notify6.dropbox.com/subscribe
2012:11:28-19:17:51 home-fw httpproxy[9134]: id="0003" severity="info" sys="SecureWeb" sub="http" request="(nil)" function="confd_config_reload_func" file="confd-client.c" line="700" message="reloading config"
2012:11:28-19:17:52 home-fw httpproxy[9134]: id="0003" severity="info" sys="SecureWeb" sub="http" request="(nil)" function="parse_address" file="util.c" line="567" message="getaddrinfo: passthrough6.fw-notify.net: Name or service not known"
2012:11:28-19:17:52 home-fw httpproxy[9134]: id="0003" severity="info" sys="SecureWeb" sub="http" request="(nil)" function="confd_config_filter" file="confd-client.c" line="2511" message="failed to resolve passthrough6.fw-notify.net, using 2a01:198:200:680::8080"
2012:11:28-19:17:52 home-fw httpproxy[9134]: id="0003" severity="info" sys="SecureWeb" sub="http" request="(nil)" function="confd_config_reload_func" file="confd-client.c" line="736" message="reloading config done, new version 88"
2012:11:28-19:17:54 home-fw httpproxy[9134]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.12.50" dstip="69.171.229.18" user="" statuscode="200" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="64693" request="0x9948810" url="www.facebook.com/.../
2012:11:28-19:17:55 home-fw httpproxy[9134]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.12.50" dstip="69.171.229.18" user="" statuscode="200" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="126153" request="0x9948810" url="www.facebook.com/.../
2012:11:28-19:17:55 home-fw httpproxy[9134]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.12.50" dstip="69.171.229.18" user="" statuscode="500" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="0" request="0x9948810" url="www.facebook.com/.../TimelinePhotosAlbumPagelet
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