This study examined the influence of motivations for, and reliance, on social network sites on selective exposure (purposely seeking agreeable political information) and selective avoidance (purposely dodging disagreeable political information). The results are based on an online survey that was posted during the four-week period surrounding the 2008 presidential election. The responses from 1,530 politically interested social network users revealed five primary motivations were found for accessing social network sites: (1) political information seeking, (2) anti-traditional media sentiment, (3) expression/affiliation, (4) political guidance/judgments, and (5) personal fulfillment. Of these five motivations, the latter three predict selective exposure but none predict selective avoidance. Reliance is not a predictor of selectivity, but gender and several political characteristics are predictors of both selective exposure and selective avoidance.