Attempting to convince users to stop doing things the easy way is futile and a filter could be implemented conveniently. Give the users what they want, to be able to type a friend's name into the comment box to share. If their incentive is to be seen publicly sharing the link with their friend in that context (proudly putting friendship on display is essential for many FB users), it could be made visible only to those users' friends.
Maybe I've internalized too much agile propaganda, but to me it sounds crazy to assume that people's preferred way to use a product is wrong, especially when adjusting to fit their preferences is so easy.
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Attempting to convince users to stop doing things the easy way is futile and a filter could be implemented conveniently. Give the users what they want, to be able to type a friend's name into the comment box to share. If their incentive is to be seen publicly sharing the link with their friend in that context (proudly putting friendship on display is essential for many FB users), it could be made visible only to those users' friends.
Maybe I've internalized too much agile propaganda, but to me it sounds crazy to assume that people's preferred way to use a product is wrong, especially when adjusting to fit their preferences is so easy.