Fall is my site for all or just me?

One of the sites that I think we should not leave anyone on your list of favorites is Downforeveryoneorjustme.com is useful to know if your site is down for everyone or just your fault you. Usually happens to me (and I guess it's my internet service provider) that sometimes when trying to enter this site does not work, then the first thing I think is to see if it will be accessible to other users or not with the aforementioned web off my doubts.