Website down or not
Everyday you visit many website like twitter , facebook , your niche related site and some web and it says “Server not found” . If it is a unfamiliar website , then you might close and move to another website, what if , it is a website like twitter, facebook does not load on your browser ? you try different browser and if you still have problem in loading website , you can try many ways to test whether the website is online or down, one such easy way is to check the status of the website in DownOrNot.com
You need to enter the website address and you can check whether the website is online or down for everyone . It simple.
Another similar sites is DownForEveryoneOrJustMe
Note: Twitter has a service to know whether the site is down or attacked by Hackers – http://status.twitter.com/