Google does go down sometimes. see links below: -
http://www.besttechie.net/2009/05/14/google-experiences-downtime/
http://www.searchenginejournal.com/googles-downtime-affected-5-of-the-internet/10463/

However, Google is a very large company with a lot of resources and has been in existence sine 1998. Twitter in spite of it popularity has only been in existence since 2006. Twitter's revenue is still in the millions while Google's revenue is in the billions. Mahalo was launched in 2007. Not sure how much their revenue is.

So, why is twitter and mahalo down more than google?
1) Google is larger, more established, makes more money, has more resources.

2) Both twitter and mahalo have become popular very quickly. They get new users ever day and the sudden grown spurt may be why they are sometimes down or slow as they try to deal with the influx of new users.

To be honest though, Mahalo is not down that much. It is sometimes slow but its downtime is minimal in my opinion. Twitter is the one with the problem. As you rightly said, they created a site just to let people know if twitter is down. Here is another site that will tell you if any site is down or if it is just you.

http://downforeveryoneorjustme.com/
Source(s):
http://en.wikipedia.org/wiki/Twitter
http://en.wikipedia.org/wiki/Google
http://en.wikipedia.org/wiki/Mahalo.com

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