I flag twitter and facebook We-haven't-seen-you-in-a-long-time messages as spam. Because those emails are also about selling a product. But as someone who runs

I flag twitter and facebook We-haven't-seen-you-in-a-long-time messages as spam. Because those emails are also about selling a product. But as someone who runs a tiny niche forum, I am tempted to mail users to return. So I am in a dilemma of sorts morally.