This is a just a quick recommendation for the internet filtering/monitoring system my family uses. (I'm not getting any kickback from this, I promise.)
Let me first say: I think if you are going to use the internet today with any regularity you should be using something to block bad content and/or keep you accountable to someone. There are tremendous benefits to the internet and amazing things you can accomplish with technology. But the bad is really bad, and it goes from bad to worse so quickly that you (and I) need to protect our own selves, as well as any family that we have.
Since starting to use it a few years back, we have been a big fan of Net Nanny. It's relatively easy to set up and use, but also really great at filtering out bad content. Recently they changed their pricing model and you can now protect up to 10 devices (computers, smartphones, tablets) for $80 a year. This was a good deal for us even though we only have three devices right now, and it's nice to be able to add more any time we want at no additional cost.
That's all for the commercial. There's plenty of options out there, just be sure to pick something.