Not if you're trying to write in a conversational tone, which is common for many blog post.

'Wanna' has a particular confrontational connotation (possibly a joking one) that I believe was desired here. 'Want to' wouldn't have had the same effect.

That's all well and good. But such a statement begs the question: Is the inverse true? Is using slang like 'wanna' bad? And does it obstruct the goal of communicating information, etc.? Does using technically correct, but archaic, words obstruct communication, and does that make their usage bad?

I ask because I would like to explore the reasoning behind the conclusion that such words are bad. If they are bad because they hinder effective communication, then so are words that are uncommonly known, I argue. Which seems to pose the argument that we should best speak like simpletons because simpletons, or people that are too pedantic, may not understand the meaning.