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San Antonio Spurs swingman Stephen Jackson, Boston Celtics forward Chris Wilcox and Cleveland Cavaliers coach Byron Scott each were fined $25,000 by the NBA on Sunday. UPDATE: Jackson was fined for a hostile tweet directed at Oklahoma City Thunder big man Serge Ibaka. Currently sidelined by an injury, Jackson apparently watched Friday’s Lakers-Thunder game on ESPN and didn’t like what he saw. Spurs GM R.C. Buford wasn’t exactly thrilled with Jackson’s use of social media. “The recent public comments made by Stephen Jackson