Is there a way to "re-link" all contacts using some button or other procedure? My contacts come from 3 sources:


Google account
Facebook
Skype


Some of those contacts were automatically linked together so "Joe Smith" appears as one contact instead of three. However, some contacts were not linked automatically.

Is there a button or some other way to tell Android "go scan all contacts from all accounts now and try to re-link them"?
I did this a few months ago by downloading a third-party contacts app, using its (much smarter) merge function, and then uninstalling the app. I can't remember for sure, but I think the app I used was either Contacts by Contapps or GO Contacts EX. There's also Contact Analyzer 2, but there are some reports of it deleting all contacts instead of merging!