After working on this for hours this afternoon (not to mention the last few weeks - I feel the need to follow directions and read everything), I think I'm ready to wrap up "More: Twitter".  
What does 
 my Twitter page say about me?  Well, I liked the basic pale blue background with bare tree limbs when I got started.  It's generally my style.  But I wanted to upload a photo I took.  Apparently they're having some current problems with uploading photos, according to the troubleshooting section I went to.  I cannot get my personalized background to load, regardless of what I do to the file size.
I updated the description of myself so that it says more about my interests.  I do list the link to my blog.  I think I do a decent job of tweeting regularly about the topics I've predefined for myself, with the occasional tweeting of something unrelated that I can't resist.  I don't think I'm really entertaining on Twitter like I think I can be in other mediums, though.  I think I show my personality a whole lot more on Facebook, this blog, and a web community I belong to.  I've seen others show a lot more panache in the 140 characters.  But I can be a pretty reserved person in some settings, so maybe that's just me on Twitter.
My social networking strategy...  Well, I've put my Twitter username on Facebook, although they don't have a field for that.  I've also put it on my blog.  And on the 23 Things Ning.  I have followed a couple of More Things participants and they follow me, too, so I feel like that's job networking, even though I haven't met these people.  I don't have my entire name on Twitter, though.  I probably would if I didn't have to link it to my blog.  I want my blog to be largely anonymous.
The people I've found on Twitter:  a couple of relatives, an online friend, a couple of people I know from my growing-up years, those couple of More-Things library people, some celebrities I'm interested in from TV and music who do their own twittering, and a gardening person or group (kind of unclear to me) who found me somehow and I decided to follow back.  There was a library person from out of state who also found me who I followed back.  But she twittered incessantly, and I couldn't handle it.  Other than that I follow some organizations.  I have learned up-to-the-minute things from following MPR.
The stage I'm at... I'm somewhere between stage 2 (I have a presence, but I don't really get why people love it) and stage 4 (although I'd say I post more useful links than I have one-on-one conversations on Twitter - I have not gotten the hang of the back-and-forth really).  I see the usefulness of getting updates from organizations I really like and people I am close to.  But so much feels like chaotic chatter.  I'm planning to cut back on who I follow once it's just up to me to use it as I choose.
In the list of 
 what Twitter is, I think it's a newsroom.  It's full of raw stories, some of which are important and some of which are not.  It's noisy, busy, fast-paced.  The point of it is to find out what's going on now, what's relevant now.  But there's a lot of chaos that you don't see elsewhere once you get the final story.
I am concerned about the security of using a lot of the applications.  I don't want to give out my Twitter password to lots of places, so there are many of the things I didn't actually try.  I did add BeTwittered to my iGoogle homepage so that I can see and post to Twitter without going there.  I don't have a cell phone that I can use with Twitter, so I can't try those mobile apps out - maybe once I get a new one.  I did add my name to the 
Twitter Directory and sign up with 
Mr. Tweet.  From one or both of those, I started getting people who had nothing in common with me and were obviously trying to get more followers.  In fact, I think I was solicited for the first time in my life!  This stream of women with similar user names started following me, and the profiles I saw showed they were looking for... well, "love" isn't really the right word.  Their accounts were mostly suspended by the time I tried to see who was following me, but I blocked the others and reported one.  So Twitter would have its hazards for the young computer user!
I ranked better as a Twitter user than I expected.  I got a 59 out of 100 for a score on 
one app, and Mr. Twitter calls me an active Twitterer with above average link sharing - but way below average conversations.
I can see the point of having a Twitter presence if you're an organization.  I think my library should set up an account to update interested patrons on our activities.  And if I ever become a person who needs to do marketing for writing or singing or independent research services, say, I'd want to use Twitter for that.