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Thanks for the reply. No message in GWMT - in fact, the opposite.... they confirmed that there has been no manual penalty after we submitted a re-consideration request. I understand what you mean about the lack of backlinks and sharing.  Nevertheless, the drop is relatively sudden... it was not gradual. I feel that if it was a lack of sharing and backlinks then we would have seen a steady decline as our competitors gained more exposure. Furthermore, the drop is across ALL sources - including direct and referral? Any advice on how you explain why we see a drop from all sources?  If the drop is due to lack of BLing or social, then the drop would be limited to organic search, no? Thanks in advance!