A QA team in one of our client has found and Error in the token forward to a Friend.
When you insert in your email template
{{system.forwardToFriendLink:default=edit me}}
And have a Online Weblink your user can get and error
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When pressing from and Email with the token a user will not get any error
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But if the User press on Look in a Browser the System online link don't work any more becouse of a missing MKTO Hash tag.
but since the funktion popup it self only need a &ftf=true you can add this in your online link and dont use your system token.
That why your forward to a friend works always. untill marketo fix there small bug.
http://Yourdomain.com/index.php/email/emailWebview?mkt_tok=##MKT_TOK##&ftf=true