Solution:
To view the request with Wireshark:
Close other browsers, open Wireshark, select Capture – Interfaces, and select Start on the active internet device. Then enter “http” in the top filter box, it will show current http requests and responses. You could also filter by port 80 (http) or 443 (https).
Wireshark shows the site is requesting http, not https, for:
platform.twitter.com/widgets.js?ver=1.1
twitter.com/javascripts/blogger.js
api.flickr.com/services/feeds/photos_public.gne
and other twitter.com and flickr.com urls.