Rodrigo is right. My husband is a newspaper editor. I read this to him and he explained it like this: When an editor writes a headline for a story, they have only a specific number of spaces to use for letters. So they often need to use words in a different way.
If this had been written in a paragraph, it probably would have been written as "Facebook is to be....." -- which makes it a little clearer that it is talking about future events.
But with the limited number of letters available, editors will often omit words that they feel readers will understand without the words actually being there.
But it is not the same a proper grammar in a sentence of paragraph.
Hope this helps.