What are some characteristics of informal writing?

Some characteristics of informal writing include:

1. Use of colloquial language and slang
2. Use of contractions and abbreviations
3. Use of personal pronouns (such as ‘I’, ‘you’, ‘we’)
4. Use of exclamation points and ellipses
5. Use of incomplete sentences or sentence fragments
6. Use of emoticons or emojis
7. Use of informal greetings and closings (such as 'Hey!', 'Take care!')
8. Use of informal tone and conversational style
9. Use of humor or sarcasm
10. Use of informal punctuation and capitalization rules (such as all lowercase or inconsistent capitalization)
11. Use of informal abbreviations and acronyms (such as ‘lol’, ‘omg’)
12. Use of informal sentence structure and syntax