#556 Improve user avatar sizing

app/helpers/application_helper.rb

@@ -43,7 +43,20 @@ module ApplicationHelper
   # Falls back to Gravatar
   #
   def avatar_uri(member, size = 150)
-    return member.preferred_avatar_uri if member.preferred_avatar_uri.present?
+    if member.preferred_avatar_uri.present?
+      # Some avatars support different sizes
+      # http://graph.facebook.com/12345678/picture?width=150&height=150
+      uri = URI.parse(member.preferred_avatar_uri)
+
+      if uri.host == 'graph.facebook.com'
+        uri.query = "&width=#{size}&height=#{size}"
+      end
+
+      # TODO: Assess twitter - https://dev.twitter.com/overview/general/user-profile-images-and-banners
+      # TODO: Assess flickr  - https://www.flickr.com/services/api/misc.buddyicons.html
+
+      return uri.to_s
+    end
 
     Gravatar.new(member.email).image_url({
       :size => size,