Taxonomy of Twitter
Taxonomy is a formal classification using a tiered term structure.
One of the taxonomies of Twitter would be the classification of Verified and Unverified accounts. This shows up as a blue tick next to the Twitter handle of the users. It separates public figures from the general public. This is useful because it represents official accounts and therefore makes it easier to identify and search for them.
Also, everybody in the Twitter-verse has a unique Twitter handle and therefore it gives each user their individuality and makes it easier for them to be found.
The Tweets are ordered in a way in which the more recent are at the top of the feed. The most popular Tweets that become re-tweeted are also towards the top.
Categories of Twitter
People can create a list of users that share the same interests and views as them. Within this, recent Tweets and updates are shown so the user can be fully informed of popular activity.
Twitter Folksonomy
Folksonomy, known as social tagging, is system in which users can apply public tags to online items, determined by everyday public. It’s a user Folksonomies democratize the way that information is structured; they’re more useful to users. One of the most important strengths of Folksonomy is that it directly reflects on the vocabulary of users.
Elements of Twitter Folksonomy
Users create tags to mark resources such as Web pages, podcasts, pictures, videos. These tags are used to managed, categorize and summarize online content. This social classification system also use tags as a way to index information, facilities searches and navigate resources. Folksonomy also includes a set of URL’s that are used to indentify resources that have been referred by users of different websites.
Hashtags are abbreviations, word of phrases preceded by a crosshatch symbol. If a large number of messages share a hashtag, an algorithm ensures these messages have higher visibility or trend.
Twitter is defined by several characteristics that increases its structure: It’s accessible; there’s no hierarchy; it’s categorize content (there is a classification system that links ideas and comments, and its generate by users.
Internal classification system
There are many different ways to search on Twitter. You can find tweets from yourself, friends, local authorities and everyone. By searching the topic keywords or hastags, your results will show a combination of Tweets, photos, accounts, and more. You can filter your results by clicking top, live, accounts, photo or videos, which are allocated at the top of your search results. You can also click more options to see above filters and from there you can choose to see results from everyone or from people you follow and from everywhere or near you
looks very appealing, also sticking to the brand identity and image. 
Angie Masih's Media Blog 