Finding out Visa's reduced their ad spend on Twitter to $10 is so funny. Ten bucks! I know people who have spent more than that on tumblr blaze.
OK so on top of this, finding out that Twitter's started to rely on bottom-grade chumbox ads because there are so few real advertisers anymore really makes things look bad for them. This is the absolute lowest-grade, least-valuable ad category around. The fact they had to develop a whole new system to serve them up - and disguise them as tweets! - really reeks of desperation.