Facebook is trying to encourage cross-platform usage and is rewarding Pages which do so.

Try to cross-promote on Facebook and Instagram wherever possible. Facebook has been pushing very hard in the past year or so to get people to use both.

They have 1.4 billion Facebook users but only 600 million Instagram users. They’ll be pushing to get Instagram’s numbers up for the next few years, and cross-promotion is going to be a key part of that strategy.