Twitter has some more growing up to do.On the one hand, its ad business is clearly maturing and showing robust growth. On the other, growth is flattening, and CEO Dick Costolo conceded the company needs to do a better job making itself accessible and useful to the masses.Twitter reported revenue of $242.7 million for the fourth quarter of last year, up 116% from $112 million over the previous year. That amounts to a profit of $9.8 million on an adjusted basis. Counting stock-based compensation, Twitter's net loss was $511.5 million, up from $8.7 million a year earlier and more than double what analysts had projected.
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