1. Necessary Within the Workplace?
1.1. While texting between co-workers, before you know the rules and norms of the workplace it can be hard to know how professional to be. Whenever you are in any workplace it is recommended to stay professional, though this attitude can slip as one gets to know their co-workers better, and maybe considers them as friends.
1.1.1. Yes
1.1.1.1. If one is working in a very formal workplace and stick to strictly professional relationships within one's co-workers, then treating text messages like casual emails might be the best route to take. Using casual slang like "Sup" and such may not be appropriate, though keeping to only basic use of punctuation will be.
1.1.2. No
1.1.2.1. On the opposing side, if one is working in a much more casual environment, where perhaps worker's relationships between each other are much closer, it would possibly be appropriate to use slang, shorten words, maybe even not use punctuation (if it is possible, and doesn't make reading confusing).
2. Are Emojis Appropriate for Use in Formal Text Messages?
2.1. Emojis are a very commonly used way of expressing things words cannot. They can express almost anything, which is what makes them so useful. They help with communicating things like mood and tone in text messages and facial expressions, or they can just be used to show an object/word in a picture instead of using words.
2.1.1. Yes
2.1.1.1. Like mentioned, they can communicate things like mood and tone and facial expressions in text messages which can greatly help the efficiency in overall communication, no matter the audience.
2.1.2. No
2.1.2.1. Though they are good at communicating things, it shows more respect to show you have the time to write out each word properly, instead of taking shortcuts. They are informal and casual, and are equivalent to using slang which would not be appropriate in formal text messages.
3. Necessary Within Friends/Close Relationships?
3.1. Texting today is a very common means of communication. When it comes to texting between friends/close relationships, the formality in real life is usually reflected onto the language used while texting. This means there is no definitive answer to this question within the aspect of texting between friends, as it is more subjective and really depends on the relationship of the friends and their personal norms.
3.1.1. Yes
3.1.2. No
4. Necessary Within Strangers?
4.1. In the situation that one is in contact with a stranger via text, the tone one use while communicating can greatly affect the reception of the receiver.
4.1.1. Yes
4.1.1.1. Because one has not yet formed a relationship with them yet, one must treat them with respect and approach the situation with formality. This includes using punctuation and correct grammar where appropriate, until one-another know how formal each other should be while texting. Treat the situation like an in-person conversation essentially, except transferred onto text messages.
4.1.2. No
4.1.2.1. Even though you haven't met them before, your texting style is your texting style.