Clicked link filter in campaigns, segments, shared filters
Currently it's impossible to add a filter in a campaign/segment to check if someone clicked on a specific link. The only option is 'clicked email' which will just check all links.
A workaround exists with a blind form submit and a shared list but this is way to complex for your average marketing user. Using the 'visited website' is also an option but it relies heavily on cookie tracking. Checking click is a basic requirement in any organisation so it would make the experience a lot better for the more average (and advanced) user.
The ideal solution would be a campaign step + new segment filter criteria where you could select the email and get a list of the links you wish to check.