About a month ago, talk began to surface that Twitter would soon begin to roll out ads (that is, their Promoted Tweets) in user timelines.
The truth is that they've been talking about this possibility for a while. And they've even tested it with third party partners like Hootsuite. But today comes the true test. Twitter will start placing them on Twitter.com.
To be clear, the sponsored Tweets will only appear in your timeline if you already foll