Hmmm...I think the 'value' of Twitter is the Networking that's possible for one to be a part of...not in some mindless back-and-forth 'tweeting' as mentioned above - sounds like some teenagers...
If you are interested in a particular subject, News, RVing, Politics, etc., etc...you can search for someone in your particular area of interest...
You can then 'follow' that person or entity to see what they are posting, and since it's only a limited number of characters, it's easy to scan for stuff you might be interested...
When 'following' someone, you can also see all the people they are 'following', as well to see if there is another person or entity you would also be interested in checking out...
As you 'follow' others, you will be notified that someone else wants to follow you, a 'follower' which you have the choice of accepting or blocking as you see fit...
If you are on a road trip in your AS, you might want to file your updates on Twitter each day, to let all your friends and 'followers' what's the latest in your adventures...
You will find any number of entities using Twitter to let you know what services and products they are promoting...they will have a short message and then a website URL to click on if you're interested...
You can also send/receive private messages to/from other followers for special info, etc...
Once you have a number of 'followers', you will all kinds of different short messages, and not the mindless banter I noted above, unless that's what you want to do...it's up to you how your structure your Home page...
Give it a try...join in or just read the mail....