To recap: I cross-posted test comments to both Twitter and Facebook; screencaps and discussion are over here.
You do have to opt in to cross-post, because if you don't connect your LJ to either of those services, it won't know where to post. People have been seeing banners at the top of their journals mentioning this--but I didn't, maybe because I have a permanent account, and the code is treating the banner like an ad? So I hadn't seen that. But it says that if you've already done the Facebook Connect thing, you're going to have to go back in and reactivate it, which also sounds like an opt-in.
Problem: I connected my Cleolinda Jones account--i.e., a pseudonym with no sensitive personal information, which makes me a better guinea pig than most people. For Science! What LJ did not say anywhere in the FAQs was that it will then announce on your user info page (the page strangers are most likely to see, other than your latest entry), under "External Services," that you, Full Name, are on Facebook. The only reason we even found out was because maetang just happened to notice.
If I had used my personal Lauren Lastname account, I would have been screwed. If your full name being on the page that Unwelcome People are most likely see is a problem for you, REMOVE FACEBOOK CONNECT NOW.
Guess what? There's also ANOTHER PROBLEM. The pingback thing is automatically turned on, according to that banner. My understanding is that if it's on, it sends you emails that someone has linked to you and emails to someone else that you have linked to them. People link to me a lot. Not unreasonably, they have linked to that last entry with the "Here's what cross-posting looks like" screencaps. So I've gotten a couple dozen in the last twelve hours, as well as--weirdly--two-year-old links to Breaking Dawn recaps and Troy in Fifteen Minutes.
Obviously, it told me who linked to me. But four of them were to locked entries that I wasn't supposed to know existed.
( And then it started sending the text of entries to meCollapse )
Yeah. You're probably going to want to turn that off.
And you know why I linked to my own recap up there? Because I'm curious to see if it'll send me a pingback to myself. And if it does: how much of this entry will it quote back at me?