Profitability at this point seems unrealistic. I understand they have around 150 employees. Assuming a conservative $100k per employee, that's $15M annually just for salary and benefits. Add server costs, etc, and its must be well north of that.
Your employee costs are off - Fully loaded, average employee costs for a company like Twitter that hires in the radford 80th percentile in Silicon Valley are approx $190,000/year - that includes Salary (avg $150K), Benefits (22.5%), and operational (computers, internet, email, phone, real estate, etc...) ($8K/year)
