“Facebook had announced in January that it was removing a feature that allowed people to cross-post updates from Twitter.”
“With the app’s sole function eliminated, Twitter decided to delete it from the Facebook platform, having no reason to think that doing so would remove old tweets that were cross-posted. It’s not clear whether Facebook knew this would happen, either.”
Looks like statuses are being restored but imagine you cross-post everything to Facebook. You delete your Twitter account thinking all of those thoughts are preserved on a network that will likely last your lifetime and then a Twitter developer deletes the app which deletes all of your tweets from Facebook.
This is why you own everything you write. Save it somewhere.