Check out PerryMarshall.com, the guy always has some interesting information. Here is some useful info on Google ads, why you get 120 characters, and the best way to make use of those characters. He writes:
"Ever been frustrated at the size limit of those tiny Google ads?
25 characters for the headline and 35 characters for each
of the other three lines. Not enough room to say very much, is it?
120 characters, that's all you get.
But there's a story behind the size of that ad. Yahoo/Overture
originally had more room than that. Google tested a number
of sizes themselves... some of my customers were beta
testers for other sizes, including 200 character ads... but
Google eventually settled on 120.
Later, Yahoo settled on the exact same format. 120 characters.
Why is that?
Because experiments proved that 120 is the optimal size for
text message ads on the Internet. If you have something
good to say, that's enough space to say it - to say just enough
to get a person to go to the next step.
If you can't say it in 120 characters, you ain't got nuthin' to say.
Isn't it interesting, 120 characters is also about the same amount
of text that fits on a highway billboard?
Isn't it interesting, most classified ads in most newspapers and
magazines are about the same size?
The classified ad at the top of this email is about that size.
Isn't it interesting, cell phone text messages are 160 characters -
nearly the same size?
It's a good size. Plenty of room if you choose your words
carefully.
Now then... one of the things I talked about at my 80/20 Seminar
in Chicago is that 5 is a magic number. That if you want to
segment peoples' level of interest, multiples of 5 are a great
way to build your funnel.
Step 1: 120 characters in a Google ad
Step 2: 120 words on your landing page (1 word = 5 characters)
Step 3: 120 sentences (1 sentence = 5 words)
Step 4: 120 paragraphs (1 paragraph = 5 sentences)
...eventually you end up with a group of people who will read an
entire 120 page book... at each step you've got a smaller
number of incredibly interested people. Years go by and
you might end up with an even smaller number of devout
students who own 120 books on one topic.
To me, THIS is the answer to that old "long copy - short copy"
debate. You start with a little and you take people through the
steps until they're sold. Some drop out and there's nothing you
can do about that.
Once the interested ones are sold, some of 'em still want more.
Give them more... and more... and more...
...until they're satisfied.
The best customer is the one who keeps coming back and
wants more, more, more.
Design your business for THAT customer, scratch HER itch,
and she'll stick with you through thick and thin. You'll be immune
to the ups and downs of interest rates and economies and all
that surface level stuff.
Go deep - in multiples of 5."