By Stefania Moretti at money.canoe.ca

“Twitter quietly took one step closer to profitability this week when it said it would ban third-party paid tweets in order to better monitor its proprietary advertising service.

In April, the micro-blogger unveiled the first phase of its Promoted Tweets service to disseminate information from businesses and organizations to wider user groups.

In a blog post Monday, the company said it would now move to block third-party ad tweets that undermine its Promoted Tweets from its timeline.”

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