1. Use absolute numbers or percentages depending on whichever sounds higher;
2. Don't put absolute numbers in context. For example, is that 119k out of 500k or 500M?
3. Only mention false positive rate if it's really low;
4. Only mention false negative rate if it's really low;
5. Don't be afraid to retroactively include data in your featured set. For example, classifying accounts banned for other reasons as spam accounts;
6. Only mention time frames if it helps your case. For example, if those accounts had been operating for a mean of 3 years then say nothing about that.
I'm not saying any of the above are true but after having seeing thousands of these pronouncements, my mind automatically goes to start asking what isn't being said here.
I remember seeing this first hand at Google with the cut backs in food (cafes and microkitchens). There were statements about "we saved $100m". That's an absolute number that sounds large. It actually amounted to something like $2/employee per day for a noticeable decrease in both quantity and quality to the point where people complained. Was that really worth it? Probably not.