'Twas brillig in the movie troves
We gyred and gimbled in the wait
All mimsey were the movie-goers
And the fan wraths outweighed.

Beware the Tim Burton flick
The flawless fright, the 3-D catch.
Beware the jaded outlook and
The frumious pysychofact.

He took his vorpal pen in hand
Long time the manxome flick he sought.
So rested he by the classics shelf
And rifled through the plots.

And as in other storybooks
The basic plot could not remain.
So whiffling through some tulgey nooks
He burbled at the game.

One, two! One, two! Renew! Renew!!
The vorpal pen went snicker-snack!
He never read what Carroll said;
He went ga-loating back.

And hast thou claimed the Jabberwock?
With Alice and her freakish friends?
"Oh frabjus pay we'll get one day!"
Tim chortled in the end.

'Twas brillig in the movie troves
We gyred and gimbled in the wait
All mimsey were the movie-goers
And the fan wraths outweighed.

Recently, Ann Handley posted "Everything I Need to Know About Twitter I Learned in J School" which is a very useful discussion of using Twitter from the Journalism perspective. Although I do not disagree with her comments,  I'd like to offer the Technical Communication perspective:
1. Be concise.
You only have 140 characters, so real estate is limited. Make the best use of it by using the right words. Most technical communicators feel they've grasped the art of brevity, but Twitter puts it to the test.
2. KISS - Keep It Simple, Stupid
Simplicity is refining your thoughts to the barest essentials. Mentioning two or more unrelated thoughts in a Tweet is likely to confuse your followers. Confused followers tend to leave. And what's the point of tweeting if no one is listening?
3. Context is king.
Make good use of # hashmarks to indicate the subject. Even though you're limited to 140 characters, you can provide access to external sources which elaborate on the context. Link to articles, blogs, or tweets for further elaboration.
4. Focus on the task.
What do you want your followers to do? Think? Respond? Follow a hyperlink? Consider the ultimate purpose of the tweet and how you can best help your followers achieve that goal.
5. Use active verbs.
Active verbs are shorter and easier to follow than passive verbs or verbal nouns. This may mean breaking grammar rules, but those are more flexible than the 140 character limit.
6. Use relevant graphics.
If you link to a picture, make sure the picture is either the focus of your tweet or somehow elaborates on what you are telling your followers. Leave it out if the relevance is not obvious.
7. Cite sources.
Retweeting is polite and helps your followers know where you got the information. There may be more to it than just a lone tweet and followers can follow-up or just follow the original tweeter. Moreover, the person you retweet will RT you back and you may gain followers from their pool.
8. Know your audience.
The most important part of any communication including Twitter is to know what your followers want to hear. If you can humorously tell them how you ate mashed oats for breakfast and they'll appreciate it, then do so. But if they're following you to hear about politics, news, or fashion, you can leave out the oatmeal tweet.

 In a room full of engineers, no one would be shocked to find numerous science fiction fans. Yet many people seem surprised to find technical communicators in fandom.
Scifi and tech comm have a long history together that begins with engineering writing. Engineering writers were the earliest tech writers and often the same engineers wrote, read, sold, bought, and promoted early science fiction.
Engineers and scientists enjoy playing with new ideas, but some of the best theories cannot easily be tested. The wonderful thing about SF is the opportunity to skip the messy, expensive (or impossible) experiments and get right to the application, usefulness, and consequences of an idea.
One of the earliest engineering dreamers was Jules Verne who wrote several science fiction stories, explaining in great detail how certain technologies might work. His clear conceptions of mechanisms and functions set the stage for others to dabble with similar devices, yet the stories still manage to entertain the reader. Verne did not let the technicality interfere with readability and this became the standard for all great modern scifi. The same standard is also a mainstay of TC.
Tech comm has a tradition of objectivity which may seem threatened by scifi themes such as social values and subjective experiences. But, in fact, this is a natural and compatible element of writing about science and technology. Faced with new, untested devices, technical writers must predict what type of audience might want to use it. They create stories about the those who would use such a device, the environment it might be used in, and what these users might want to know. It doesn't take too much to stretch the imagination from What Is to What If. And as soon as you're in the realm of What Ifs, you've achieved science fiction.
More than ever, tech writers are expected to predict the future and anticipate needs. Habitual SF readers find this easy which translates into success as technical communicators.
To the technical communicator, the usefulness of SF is more than stretching the imagination; it's tapping some of the greatest minds for possibilities and results which would otherwise be unavailable to one person or team. The usefulness of TC to science fiction is a little more obscure.
Any professional writer who has taken a course in technical writing would admit the effect it has on his or her writing. The clarity and focus of TC helps authors stay on topic and precisely approach a subject even when the subject matter is not factual. It's even been suggested that the great writers of the 21st century will come from technical writing just as the great writers of the 20th came from journalism.
This interaction between TC and SF will continue to develop as leisure readers become more tech-savvy, teachers incorporate more science fiction in classwork, and the scifi genre becomes more mainstream. Eventually, tech writers will be ubiquitous in fandom rather than an oddity.

These are the signs that you've outlived your usefulness to the world of technical writing:
10. You translate your spouse's every word into Plain English.
9. It's not the graffiti that bothers you, but the misspelling of "mother."
8. SMEs ask YOU questions.
7. Your name appears on every wikipedia edit page.
6. Upon hearing the Next Big Thing you think "I want to document that!" before thinking "I want one!" (Thx K. Mulholland)
5.  You carry whiteout and a dictionary next to your lipstick and compact (or in your pocket protector).
4. Reference sites link to you.
3. You actually know how to use a semicolon.
2. You make your kids write a business case for why they should have something (like the latest phone). (Thx B. Graham)
1. You refuse to bookmark this list due to the number of grammatical and punctuation errors.
Bonus sign you've worked in tech writing too long:
OED calls you for suggested definitions of new terms.