What if I accidentally checked that box that says 'Repost to Facebook' just before I press the Post button?
Well, this is what I found out: as long as I'm not logged in Facebook or Twitter via LJ, those checkboxes are not enabled (which of course means I'm not able to select it). Phew!
Now, for strange reasons, if you do want to cross post, you would need to log on to Facebook or Twitter via LJ first. Notice merely logging on to those accounts on the same computer is not enough. You would have to go to the account setting on LJ to connect to Facebook and/or Twitter.
To login or logout from these social network sites, go to your setting extensions to make the appropriate change.
FYI: as of this morning, if you try to connect to Facebook, you'd get a message that says
Bogus form data; please go back and try again.- me think LJ must've been bombarded with angry users since last night that they scrambled to keep the situation under control.
Besides the cross post option, LJ also implemented a related service called "pingback". Now, what are pingbacks? You can refer to FAQ #293 for a description. In a nutshell, when the pingback service is turned on, it is designed to alert you when someone linked your post in their own LJ posts. At first glance, this seems to be a desirable service. After all, who wouldn't want to keep track of what other people are saying about what s/he wrote in her/his posts, eh? However, here's the catch: when you turned the service on to keep track of where your posts are linked to, you also agree to allow LJ alert other users who chose to enabled the pingback service should you link their posts in your entry or comment, even if that entry or comment is flocked or private. Scary isn't it? Especially when the alert is sent, LJ quotes ~600 word context surrounding the link in question, regardless of the privacy setting of the post.
So yes, I think the pingback service is a double edged sword. In the spirit of keeping my privacy intact, I'd rather stay ignorant of who's linking my post to where. To turn on/off the service, you can go to the privacy setting of your account to make the appropriate change.
And lastly, felisblanco mentioned that LJ has now fucked up its handling of "/" in their tags. So if you see an LJ tag that has a "/" in it, and try to get the tagged entries, it won't work any more! I wonder how long it's going to take LJ fix that. If they don't do it soon, they might have a massive exodus of users from LJ land on their hand.