Wordpress Jetpack is a rich plug-in and I wouldn't recommend installing it unless you were going to use a range of it's features.
Also, if you are serious about social media, the auto-updates tend not to be very engaging unless you can tweak them for each individual update.
And if you have folk following you using more than one social media channel, they might find it off-putting, especially if the updates all go out at the same time.
I tend to use hootsuite's autoschedule tool and I'll try and alternate between using the same update on all social networks and different updates on each network.
At least with the autoschedule tool, even if I send the same update out to all the supported social networks, at least I know there will be some variation in the timing.