Could someone please break down positive face and positive face? I have a rough idea but not a solid idea of these two things.
And also, how does non-standard english play a role in informal texts?
Thanks
Here you go!

Positive face refers to a person’s need to be accepted or liked by others, and too be treated as a member of a group knowing that their wants are shared by others.
Negative face refers to a person’s need to be independent and not be imposed on by others.
According to Brown and Levinson , in order to maintain social relationships, people need to acknowledge the face of other people. Thus we seek to make the other person feel good. People aim to build up the closeness and rapport with each other ( their positive face ) while trying to avoid being a threat to each other’s social distance ( their negative face ).
Positive Politeness Strategies:
Shows closeness, intimacy, solidarity and rapport
Notices or attends to the other person’s wants, needs or possessions
Intensifies one’s interest , approval or sympathy for the other person
Uses in-group identity markers e.g. in-group address forms, jargon and slang.
Chooses topics you’ll both agree on
Hedges and/or tells white lies to avoid disagreement
Presupposes or asserts common ground between people
Makes offers or promises
Assumes or asserts reciprocity
Use of “we” rather than “you”
Negative Politeness Strategies
Gives the other person choices, allowing them to maintain their freedom
Uses indirect speech
Does not presume or assume by asking questions such as “could you do this for me?”
Begins with “ This probably won’t be necessary but…”
Minimises imposition on the other person” I just wanted to ask if I could…”
Gives deference by the use of certain forms of address
Apologises to the other person by indicating reluctance or asking forgiveness” I’m sorry to be asking you this…”
Makes requests/statements less personal by using “you” instead of “I”
Other factors that might impact on one’s choice of a politeness strategy might include social distance, power relationship between the two interlocutors, context and audience.