If you have been following the news, as I’m sure you have, the FCC is going to get rid of net neutrality. There’s no way around it, we can petition our congressmen and women, we can protest, we can throw stones, we can jump up and down, we can burn flags, but it won’t stop the inevitable. Your ISP controls (or will control) your internet. All of it.
They have the capability to not only intercept and read everything you browse, post, write, send, the passwords you enter and the porn you watch (come on, we all know you do it.), they can actively alter the HTML you receive on the fly. It doesn’t matter if you are on a secure site, because it’s possible (even easy) to spoof a certificate. I’ve done this using MITMProxy, seriously, it’s scary shit. This means that EVERYTHING you do online is susceptible to surveillance and can be used against you.
So, what can you do? Not much, considering they already control the situation.
But there is one way around this. TOR browser. It’s an anonymiser that effectively masks your sites from the ISP. It’s free and open source. Use TOR and you will never be spied upon again.
Good practice also dictates that you should use encryption when sending emails or other forms of communication. PGP/GPG is a good tool for this, if someone uses a super computer, it would take about a hundred years for a message encrypted using PGP to be cracked. Unless you like people reading all of your emails and looking at every attachment you included.