Some websites work, but some don't.
Some websites work, but some don't, on all browsers I use (chrome, safari, firefox). I get a "The webpage at ___ might be temporarily down or it may have moved permanently to a new web address." It happens for facebook, yahoo, google, youtube, bing, etc. Twitter, Tumblr, Buzzfeed, Apple (obviously) all work fine. My MacBook pro is from early 2008 and I'm using Mac OS X Version 10.5.8. It's not an internet modem or wireless router problem, as I've already done customer service troubleshooting with both.
MacBook Pro, Mac OS X (10.5.8)