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Must be logged in to email an Instructable to a friend

For some time, we've allowed anyone, site member or not, to email an Instructable to a friend or two simply by entering the friend's email address and clicking a couple buttons.  On Sunday, against our terms of service (see link in the footer), someone ran a script that hacked this feature to send out mass emails to a very large number of people.  And the emails looked like they came from us.  Not good!  I hate to say it, but someone used Instructables to send out spam.

So, yesterday I updated the site to prevent this from happening again.  I changed it so you could only use this feature if you were logged in.  We're thinking about different ways to handle it, to still allow people who don't have an Instructables membership to share Instructables with friends, but limit it in some way to prevent anyone from sending spam again.  Once we've decided on the best long-term fix, we'll implement it and I'll post about it here.