[Rails] safe html links

[Josh Rickard]

Hi,

I'm working on a web app that allows users to submit links to external
sites.  I'm curious if there are any special security considerations I
should take aside from escaping the user input with h( )?  Is it safe to
directly link_to h(user_inputted_url), h(user_inputted_url) or could that be
exploited in a way that I'm not thinking of.  Thanks.
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