Expect to see more ads flowing through Twitter’s stream of tweets in the coming weeks, but don’t expect to read anything soon about an IPO from the online messaging service.

Twitter CEO Dick Costolo delivered that message in a meeting with a group of reporters at the company’s San Francisco headquarters.

After bringing in more management talent and upgrading its service so it can handle big spikes in messaging, Twitter is ready to get more serious about building a successful business.

Twitter is expected to generate about $150 million in ad revenue this year, up from $45 million last year, according to the research firm eMarketer Inc.

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