Through the process of SMS (Short Message Service) subscribers can communicate with the Twitter via five gateway numbers: short codes for Canada, New Zealand, United States, India, and an Isle of Man – number for the international use. For the United Kingdom there is another short code which is accessible only to those of the Vodafone network

On April 30 in the year of 2009, Twitter made its web interface with addition of a side bar and a search bar of Trending Topics —the most usual phrases presently appearing in the messages. Every individual update their sent to the Twitter from anywhere 24/7 round the world can be directly indexed. “With this fresh launched feature, it has become something very unexpectedly important to the subscribers—a search engine for finding out the instant happening right now around us.

When there is an outage in Twitter, users see an error message image of “fail whale” created by the Yiying Lu, a figure of red birds using the nets to haul up a whale from   ocean along the side of the text.

Twitter experienced nearly around 98 percent of uptime in 2007.Twitter’s downtime was mostly noticeable during Macworld Conference and Expo keynote address in the year of 2008. An architectural change was made by the fresh engineering team Twitter during May 2008 to deal with the various scale of growth. This issue of stability resulted in temporary or down time feature removal.

In August 2008, Twitter withdrew scheme of the free SMS services in August 2008.to users of the United Kingdom (U.K) and nearly about for five months, the instant messaging support through a Jabber bot was marked “temporarily unavailable”. On October 10, 2008, there was another announcement by the status blog of Twitter’   that the service of Instant Messaging (IM) was no more a temporary outage and required to be revamped. Twitter aimed to return its Instant Messaging service at few point but said, it requires a major work

On June 12, 2009,”Twitpocalypse” the so called potential, an exclusive identifier associated with each tweet surpass the limited signed integers of 32 bit. But here the Twitter itself was not so affected but some of the third party clients found it very difficult to access their recent tweets. As soon as the patches were released to cope with the situation but few of the iPhone application was still in queue for the further approval from App Store.

On August 6, 2009, Face book and Twitter suffered an attack from the denial-of –service which made the website offline for several hours. But it was later detected that the attacks were pointed at a pro-Georgian user during the anniversary of the “South Ossetia War”, 2008 rather than to the sites themselves.

Twitter collects the personally identifiable information of its subscribers and shares it with the third parties. Twitter do not displays any advertisements, advertisers can target the users based on the history of tweets and sometimes can quote the tweets in ads.