A few days ago I activated Jetpack on one of my sites and connected it to wordpress.com, no real reason, just wanted to see what happened. In the few days since my traffic to that site has doubled and I've gotten about two new subscribers a day, which isnt' bad considering the site is about 2 weeks old.
So here's my question, I've Googled and found very little information about this feature, and I'm curious if anyone on here who has more wordpress experience than me, knows if there's a reason why. Is it a new feature? Is there a downside that I will later find out about?