The Official Computer Tech Support Thread

[Freebase Dali]

Originally Posted by LoathsomePete

Just me from the looks of it, I saw a lot of Facebook profiles open, and yes it was all wireless.

Well if it was just you (or at least not everyone) that obviously narrows it down quite a bit to problems related to your computer.
But just for information's sake, like s_k was saying, connectivity between a computer's wireless card and the wireless router/access-point happens at the authentication stage. Even if the AP was unsecured, there is still authentication involved, simply by choosing to connect to an SSID (whatever name the AP is broadcasting). After you connect, the only thing that has happened is that the AP has agreed to let you transmit data to it. If the actual connection to the ISP is down, you'll still be authenticated with the AP, thus, connected.
But if you go to your network and sharing center (Vista and above) it should make it clear that there isn't an actual connection to the internet simply from the grayed out world icon.

I was just wondering, do you use wireless at home, or do you use a cable for your internet connection?

It's difficult to offer a plausible explanation for this type of issue without certain information, or else you'll just get a long list of a lot of things that don't apply at all.