After banning UberMedia’s (news, site)  UberSocial and Twidroyd apps last week, Twitter has agreed to lift the ban so users can once again run them on their smartphones, after UberMedia agreed to some changes.

According to Twitter’s help page, the third-party apps were banned for what it described as “policy violations," in a move that left millions of users without access to the apps.

There isn’t a lot of information as to what exactly those policy violations were, but Twitter did elaborate that they concerned privacy issues around messages that were longer than 140 characters, as well as allegations that UberMedia was using affiliate links and changing tweets in an effort to monetize them.

UberMedia and Twitter

UberMedia’s Bill Gross, cited in TechCrunch, denies that they would or ever would do such a thing, but the claims were enough to see the apps banned for a few days.

However, all is well in the Tweetesphere as both Twidroyd and UberTwitter -- now under the name UberSocial, as part of the agreement -- are available again.

Gross, apparently didn’t kick up too much of a fuss and told TechCrunch that whatever they have to do to keep in Twitter’s good graces, they will do. “Whatever it is, we will change it,” he said.

UberMedia and TweetDeck

This, of course is the same UberMedia that announced only recently that it was just about to close a deal to buy TweetDeck in a deal that is estimated to be worth US$ 30 million.

The deal will, in effect, give UberMedia control of 20% of all the tweets sent daily, and make it the biggest Twitter client outside of Twitter itself.

While that in itself is significant, what was probably more significant is that this is the third such deal by UberMedia since the beginning of the year alone and underlines Gross’s stated ambition of becoming the biggest player in the Twitter ecosystem.

Only a month ago, it announced it was buying UberTwitter, a company that makes Twitter clients for iPhone and Blackberry. That was only two weeks after it had announced the acquisition of EchoFon, which produces a native Twitter client, a Facebook app for the iPhone and a Twitter iPad app.

Whether this has anything to do with Twitte'rs recent ban is anyone’s guess, but it must have been on the minds of the directors of Twitter when they were making the decision.

That said Twitter has always been adamant about compliance and sticking to the rules, just as it has been about urging users of Blackberrys, iPhones and Androids to use its own Twitter client. Watch this space.