Bing has quietly dropped the Twitter option from the Bing Webmaster Tools Contacted Pages option. Bing said "by adding the various web presences as "connected pages" in Bing Webmaster Tools, you can get an overview of how many impressions and clicks you are getting not only for your main website, but also for each of these connected pages."...
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Bing Drops Twitter From Connected Pages
seroundtable.com