Talk n. : To utter words; esp., to converse familiarly; to speak, as in familiar discourse, when two or more persons interchange thoughts.

Talk n. : To confer; to reason; to consult.

Talk n. : To prate; to speak impertinently.

Talk v. t. : To speak freely; to use for conversing or communicating; as, to talk French.

Talk v. t. : To deliver in talking; to speak; to utter; to make a subject of conversation; as, to talk nonsense; to talk politics.

Talk v. t. : To consume or spend in talking; -- often followed by away; as, to talk away an evening.

Talk v. t. : To cause to be or become by talking.

Talk n. : The act of talking; especially, familiar converse; mutual discourse; that which is uttered, especially in familiar conversation, or the mutual converse of two or more.

Talk n. : Report; rumor; as, to hear talk of war.

Talk n. : Subject of discourse; as, his achievment is the talk of the town.

Example:
How do you Talk to somebody about global warming and religon?

Taxonomy
internet calls, file sharing.

Defination from the web:
Google's approach to IM adds internet calls, file sharing, notifications and other features for a richer instant communications experience that is more than just instant messenger or online chat.