The Truth About Twitter

Here's what Twitter is not:

Twitter is not your therapist.
Twitter does not understand when are being passive-aggressive.
Twitter is not a secret-keeper.  If you put it out there, Twitter will tell his friend Google.
Twitter is not your own personal Room of Applause. If you need affection, get a puppy.
Twitter is not your marketing campaign.
Twitter is not how you get an agent/editor/critique partner (usually).
Twitter does not understand sarcasm 30% of the time.
Twitter is not the end all and be all of social media.
Twitter allows you to 'know' people, but you don't actually KNOW them.  They do not owe you favors, swag, reviews, critiques because they follow you.  They do not owe you a follow-back just because you follow them.
Twitter doesn't recognize quantity over quality.
Twitter does not mandate that all @replies must get a response.  Sometimes people are busy.  Or sometimes they don't have anything to say back.  That doesn't mean anything.

Here's what Twitter is:

Twitter is a social media tool.
Twitter allows you to network with likeminded individuals.
Twitter gives you a new way to interact with your heroes, your favorite writers/singers/producers/whatever.
Twitter rewards quality – more people follow you, more people talk to you when you have something to say.
Twitter can help you augment your other marketing efforts by spreading the word about upcoming releases.
Twitter can put you into contact with people/agents/editors looking for the kinds of things you write.
Twitter makes it easy to sever relationships.  It's called unfollow.  A quick jump in followers won't last if you're not putting out decent, interesting content.
Twitter is 140 characters.  There is no 'hidden 300 character meaning' behind what someone says in 140.  What they say is what they mean.
Twitter is a tool.  Nothing more.

What do you guys think?  What is Twitter?  Or what is it NOT?