“What are you doing ?” - Twitter wants you answer this question in 140 characters or less. If your tweet is longer than than 140 character limit, it won’t get published from the web.
A workaround can be that you write your message on some online clipboard service and post that link to Twitter.
Now this is very cumbersome and secondly, your twitter friends will have no click the link to see what your message is all about.
A practical solution to this problem is Twitzer - a Firefox extension for Twitter that will short tweets that seem to cross the 140 limit.

Type your “extra long” tweet in the Twitter box and shorten with a simple right click. Twitzer truncates only some part of your message and replaces it with a link to the full message.
This Twitter add-on is from the same guys who developed ShortText.
Find this article at: http://www.labnol.org/internet/tools/write-text-longer-than-140-characters-in-twitter/2665/
web: http://www.labnol.org/ email: amit@labnol.org


Reader Comments
Great extension, it works with Firefox 3 Beta 4 also. I tried it and it works like a charm. Thanks for sharing this great tool.
Written by Chris on 03.21.08
This must be useful. Apparently the download link was currently off the net. Thanks Amit, i stumbled this one.
Written by Robin on 03.21.08
another workaround
copy paste ur url into the twit window, it gets converted automatically into a tiny url.
finished
srini
Written by srini on 03.21.08
We always have to limit out text in twitter… So i think this will a much very useful extension… what srini said is also true…
Written by Kevin on 03.22.08
Amit,
As we often have trouble parsing our messages, we’ve had great success with the auto-truncating link .
The archive for (truncated) our Twitter messages and (full text) link make an interesting on-line comparison.
Thanks for making Digital Inspiration a daily must-read.
Respectfully Yours in Safety and Service,
Brian Humphrey
Firefighter/Specialist
Public Service Officer
Los Angeles Fire Department
Written by Brian Humphrey on 03.22.08
this is great to know… will surely be downloading forefox extension!!
Written by Moksh Juneja on 03.22.08
this works pretty well.. these guys are very fast in responding!! :-)
Written by Moksh Juneja on 03.24.08