I don't use Avast Web Shield any more because on many video sharing sites, it blocks the entire website or blocks some videos on those sites. When I add Exceptions or report false positives to Avast, more and more video sites or components are blocked. When I tried other antivirus, they don't block these sites.
Perhaps Avast depends on community reporting which is dependent on the intentions of those reporting. Avast should make its Web Shield useful again by using databases used by other AVs or investigate before blocking.