Cheeky exchanges between PM Lee and Workers' Party of the first sitting of Parliament

The first sitting of the 13th Parliament was on 15 January 2016 (last Friday). Prime Minister Lee Hsien Loong posted several photos of the Members of Parliament (MP) on his Facebook, and among them was a picture of the Workers' Party he personally shot. PM Lee personally captured the moment, and captioned the black and white picture of Workers' Party MPs taking a group shot at the front steps of Parliament with the hashtag, 'guesswho'. The picture was the only black and white picture in the series, and one commenter said that PM Lee is being very cheeky for putting on an ominous filter for this picture. Workers' Party has responded in a similar cheeky manner to PM Lee posting the picture. They shared the Prime Minister's picture on their Facebook with the caption, "Thank you PM Lee for the classy b&w pic. You have a natural eye for a good shot! ‪#‎guesswho‬". Are such exchanges a precursor of things to come?