A number of Facebook users were surprised Tuesday when some of their old posts disappeared — specifically, all the updates that had been cross-posted from Twitter. It turns out Twitter was surprised, too.
The bottom line: Facebook had announced in January that it was removing a feature that allowed people to cross-post updates from Twitter. As a result, Twitter deleted its Facebook platform app, which had been rendered useless when the changes went into effect earlier this month. But it had no idea old posts would go away once the app was removed.