Watch this space: Liberal leadership on Twitter

Who says you can't learn anything on Twitter? This afternoon, during Question Period, some Liberal-leadership merriment. 

It started with this cryptic tweet from Canada's first man in space, Marc Garneau, who told me at Montebello he wants to run for leadership, but he's not yet sure he's going to take the plunge. 

What could this mean? Sure enough, another prospective candidate waded in, with his own cryptic tweet. 

The indefatigable Kady O'Malley noticed: 

And yes, I had to wade in with my own smart remark, throwing in that oft-cited caveat on Twitter: 

Not so fast, said Mr. Trudeau. 

What's this? Trudeau endorses Garneau? For what it's worth (for the humourless out there) I believe this was all in fun. And in case you were wondering about the tweet that started it all, Mr. Garneau had an explanation, straight from outer space.