From my notes

Negative Politeness
-Avoid blasphemy, vulgar, derogatory language.
-For example, “Jesus Christ” may be offensive to Christians, so it should be avoided.
-Taboos should be avoided. Safe topics such as ‘the weather or ‘how’s your day been’ should be discussed
-Politeness markers such as ‘please’ ‘thankyou’ ‘would you mind’ should be adopted
-Interrogative sentence type should be used rather than the imperative.
-Transactional conversations, and should involve semi-formal greetings and endings.
Positive politeness
-Dysphemism such as ‘idiot’ ‘slut’ and ‘cunt’ may acceptable depending on social relationship
-Shows social intimacy between interlocutors
-Less appropriate topics may be discussed e.g. sex and money
-Nickname vocatives can be used. i.e. diminutives such as Davoo or T-dog