-1. Website management is very poor for many Chabad Houses. A person contacting the shliach once a month to get updated info is more likely to be accurate than the shliach's own site.
A webform sent once a month/quarter-
Has anything changed? Yes/No
Choose "No", end of survey. Site is updated that info is current.
Choose yes, select category of what changed, enter new info, site gets updated and is current.
This is assuming that Chabad has the resources to update thousands of sites regularly (unless they do this already).