Twitter, the microblogging service, is gradually evolving its design on end user profile pages, and as we predicted at The Next Web recently, is now running advertisements for external services.

Today, we spotted an ad for ExecTweets running on Twitter.

20090324 fbaih25jfpinxfud9rxitx3e5 Like we said. Twitter introduces advertising.

TweetSense, here we come…

As we said:

… in the future – well, they are short, unobtrusive and perhaps easily able to adapt themselves to fit your tweeting style?

UPDATE: Advert now also spotted for Twittervision:

20090324 qqh4cx8n775edc72kxfpf9npfx Like we said. Twitter introduces advertising.