This study investigates what explains the level of support candidates generate on Facebook and what strategic assessments campaigns are making about this community of (potential) supporters. Based on data collected about 814 major party candidates for the U.S. House of Representatives in 2008, it appears that the Facebook community responds to the same array of factors in the larger political environment as the general public when registering its collective judgments about candidate viability through Facebook support. Results of the multiple regression analyses show that the amount of campaign contributions raised is the most important variable explaining Facebook support, especially for challengers and open seat candidates. In addition, Democrats have more supporters than Republicans, and incumbents more than challengers or candidates for open seats. A competitive race increases supporter numbers for non-incumbents. When Congressional districts have with a high percentage of college educated citizens it increases candidates’ supporters, but a high percentage of young citizens diminishes their numbers. Finally, candidates who have active Facebook pages, either because of their own updating of content or as a result of postings by current supporters, generate more new supporters as a result. Campaigns that do not engage in an activity that is relatively common and easy to do (video uploads)are penalized in Facebook supporter numbers. Degree of effort works in reverse for user generated activities: candidates who have more low effort wall posts generate more Facebook supporters; those with more high effort fan photo postings do not end up with significantly more supporters.