1. A computer-implemented method for managing bidding in a real-time bidding system for real-time online auctions for impressions using a control system configured to control a plurality of geographically distributed bidding servers, the method comprising: enabling, by the control system, the plurality of geographically distributed bidding servers to engage in real-time bidding on impressions for a campaign; wherein each enabled bidding server engages in real-time bidding for the campaign by: receiving from a real-time bidding exchange a series of real-time bidding requests, each corresponding to a real-time auction for an available impression in a webpage being loaded at a respective browser; and for each received bidding request, determining in real-time during the loading of the respective webpage whether to submit a bid on the available impression; the control system automatically performing a provisional control of enablement/disablement of each bidding server with respect to the campaign based on real-time available raw campaign performance data for the campaign, wherein performing the provisional control of enablement/disablement of the respective bidding server includes: collecting, by the control system, raw campaign performance data for the campaign available in real-time, the collected campaign performance data comprising at least one of: impression data generated by at least one impression server that receives impression requests from browsers and responds to the impression requests from browsers, the impression data indicating a number of delivered impressions for the campaign; and event data generated by at least one event tracking server that receives event requests from browsers and responds to the event requests from browsers, the event data indicating user actions related to delivered impressions for the campaign; automatically comparing, by the control system, the raw campaign performance data to one or more predefined performance target metrics for the campaign; and automatically disabling at least one of the bidding servers with respect to the campaign based on the comparison of the campaign performance data to the one or more predefined performance target metrics for the campaign, such that each disabled bidding server terminates bidding on impressions for the campaign; following the provisional control, for each bidding server, automatically performing a supplemental corrected control of enablement/disablement of the respective bidding server with respect to the campaign, including: adjusting, by the control system, the raw campaign performance data by at least one of removing invalid data, removing duplicate data, and correcting erroneous data; comparing, by the control system, the adjusted raw campaign performance data with the one or more predefined performance target metrics for the campaign; based on the comparison of the adjusted raw campaign performance data with the one or more predefined target metrics for the campaign, re-enabling at least one disabled bidding server with respect to the campaign, such that each re-enabled bidding server resumes bidding on impressions for the campaign; wherein each bidding server operates as a stateless device unaware of operational details, enablement, and disablement of each other bidding server.