and this is the problem faced with some tech companies following an IPO. Overvaluation leads to investor expectations driving good core products away from their initial culture. You either need huge growth forecasts (Facebook) or be able to monetise easily. This is a shame as Twitter is ultimately very good at its job of linking people's thoughts and interests together.
Twitter is building a new feature that will allow users to tweet things longer than the traditional 140-character limit, and the company is targeting a launch date toward the end of Q1