Daily Blog Tips conducted a survey on Twitter CTR. The Post and the Follow up are here:
http://www.dailyblogtips.com/what-is-the-average-ctr-on-twitter-lets-fin...
and here:
http://www.dailyblogtips.com/tracking-clicks-on-twitter-the-results/

Here's the posts:

What Is the Average CTR on Twitter? Let’s Find Out
Twitter is certainly a new tool for online marketers and website owners, as it can be used to generate traffic to any page, from blog posts to services and sales pages.

The problem is that we don’t know how efficient this tool is. More specifically, what kind of CTR (click-through rate) do Twitter accounts have? That is, how many people would click on a link tweeted by an account with X followers?

Obviously the CTR will vary from case to case, as some accounts will have more engagement with their followers than other accounts, but I guess it would be possible to find an average, or at least a ballpark number.

If I needed to make a rough guess, I would say that the ballpark CTR is between 0.25% and 2,5%. So an account with 10,000 followers would get anywhere from 25 up to 250 clicks on its tweets.

If we work together, though, we can try to improve that guess. Here is how:

1.First of all create an account on bit.ly (takes 2 seconds).
2.After that pick a web page that you would like to share with your followers (like a post from your blog or some cool website), and shorten the URL inside your bit.ly account.
3.Tweet a message describing that page and containing the bit.ly link.
4.Wait at least a couple of hours and count the total number of clicks.
5.Post a comment below informing how many clicks you got and how many followers you have.
It is necessary to create an account with bit.ly and log into it before shortening the link else you will not be able to track your individual stats.

I will do this with my Twitter account as well, and after you guys post your comments I will group the data and try to analyze it. Next Tuesday I will post the results.

Thanks in advance for everyone who will help.

and:

Tracking Clicks on Twitter: The Results
Last week I wrote a post titled What Is The Average CTR on Twitter? Let’s Find Out. The goal was to try to understand better what kind of CTR Twitter accounts have. Many readers entered the discussion with their opinions, and here is what we got in the end.

First of all I agree with the people who said that talking about CTR on Twitter is not completely accurate. CTR measures the number of clicks that you get on a certain web page or email message, out of a total number of people who will be exposed to that page or message. On Twitter we don’t really know how many people will be exposed to the message, because not all followers are online when you send a tweet, and because some of your followers might also retweet your tweet, passing it along to people who were not following you in the first place.

Perhaps we need a new term. Something like CPF, or clicks per follower. Obviously the CPF will vary from case to case. Some factors that will affect it include:

•how the followers on the account were gained (i.e., mass following or not),
•what kind of engagement the account owner has with the followers,
•the time when the tweet is published,
•the number of power users following the account owner, and
•the relevancy and usefulness of the tweet in question.
Despite those factors, I think it is still possible to find an average range for the CPF on Twitter. Last week I had guessed that it would be between 0,5 and 2,5 (clicks per 100 followers), and after collecting the numbers submitted by our readers I believe that was a good guess. Here is a graph illustrating the CPF reported by each reader:

Some facts:

•The average number of clicks per 100 followers was 2,37.
•If you remove the three spikes (that seem to come from accounts with very engaged followers and therefore many retweets), the average falls to 0,9.
•The largest CPF was 12.5 clicks per 100 followers.
•The smallest CPF was 0.3 clicks per 100 followers.
Obviously the sample size is too small for us to derive any definitive conclusions, but I find the numbers interesting anyway. For example, if you are currently getting fewer than 0.5 clicks for every 100 followers, there is something wrong there. You should try to increase the relevancy of your tweets and to build a better relationship with your followers.