We were doing a study to decide if we should divide the different educational related websites under different domain or subdomains (www.school.education.com) or all under one domain (different subfolders likeĀ www.education.com/schools ) or use the subdomain option for folder option for WPMU.
After a lot of study we decided to go with only one single domain for all the different resources (all related to education).
Let me tell you the reason,
– We found that using different domains will divide our visitor and hence decrease the over all ranking of all our our domains in search engine.