This is what Twitter’s homepage looks like today:
Their maintenance notice is broken too:
Twitter is currently down for <%= reason %>.
We expect to be back in <%= deadline %>. For more information, check out Twitter Status. Thanks for your patience!
Google has been experiencing outages as well, with their Google Talk service:
This once again reminds us that running a complex distributed system is hard, and 100% guaranteed uptime, all the time, is not commercially or technologically feasible – just ask Amazon (and Netflix, Instagram, and Pinterest) about recent power outages.
SLAs are useless. If you use cloud hosting providers, you should focus on designing your apps for failure.