As the Twitter community grows so does the number of third party applications built around it. From fully-fledged clients like Tweetdeck to visualisation tools like Twittervision, the diversity in what’s available shows just how much of an impact the micro-blogging service has made.

One of the latest Twitter services to launch is Mr Tweet. The service is based around the idea of filling the ‘holes’ in the list of people you follow. No matter how hard you’ve worked at building up a list of people who interest you there are probably a few people that you’ve missed. By comparing the people you follow with the people that they follow, it displays a list of people you’ll probably want to follow.

Mr Tweet is simple to use.  You simply follow the service’s Twitter account, they follow you back and then you sit back and wait.  After the service has analysed  the list of people you follow it builds up its list of suggestions and sends you a Direct Message containing a link to a web page containing your results.

So, how does it fare? Well, the first few pages of my results feature many of the ‘usual suspects’ – Pete Cashmore, Loic Le Meur – people who are massively popular but that I choose not to follow for whatever reason (not that I have anything against them). Much more interesting were the people further down; people who aren’t hugely popular ‘Twitter-stars’ but who I might actually benefit from following and who might actually be interested in what I have to say.

So, Mr Tweet definitely has worth but even it’s developers admit that it’s not perfect yet.  My only concern at the moment the is feature on their site that allows you to follow people directly from their page.  In order for this to work it needs your Twitter login password.  You may remember the controversy a couple of weeks ago, when TwitterRank became popular.  It too was asking for login details in order to give you a ‘rank’ based on your popularity on Twitter.

People warned that TwitterRank may simply be a scam to harvest Twitter IDs but it turned out not to be the case. Could Mr Tweet be similar? I had initial concerns that maybe it was but today I’m more inclined to believe it’s a genuinely good-hearted service.  Why the change of mind?  For a start, in the last 24 hours they seem to have got rid of an automatic tweet from your account when you followed someone via the service (it appears to have gone, anyway).  The site now simply encourages people to spread the word about the service.  It shows they’re willing to listen to suggestions on improvements.

I’d still be inclined to follow new people the Mr Tweet introduces you to via the Twitter site instead of via Mr Tweet itself.  After all, the fewer people you give your login details to the more secure you’ll be.

At the time of writing, the service is down (apparently after Robert Scoble crashed it by running his enormous Twitter follows list through it).  When it comes back, why not give it a go?  You might find some interesting people you’ve never heard of.  Let’s face it – that’s what Twitter’s all about – interesting people.