I personally have setup my PLN through my Twitter, Blog, Facebook, and a few other social media sites. I get a lot of great content from my PLN, however sometimes I get the feeling that there is just too much out there and I am missing a lot of great things. A piece of advice offered to me, that has helped keep me from being overwhelmed has been:
"Think of Twitter as a flowing river. Walk up to it, dip your bucket in, and walk away. You'll never catch everything, but see if there is something you caught that you can use."