We know they make at least 100K each day (per market?) for Promoted Trends, which Ev said they were out of stock on. That doesn't count promoted tweets. We also know the firehose access they gave to MS + Google cost millions of dollars each. Which is separate from the access they gave Gnip. The screenshots of the business-friendly analytics tool they have coming out soon seems like it could be a "pro" tool, though I won't full on guess they will charge for it.