How to merge contacts on a HTC android phone?

[Beyond_Life]

I own an HTC One X from 2012. Not the new one but Im guessing all HTC phones have this problem. I use Google to store my contacts, like every sane person. And in my phone I can select accounts to be shown in the contacts, like facebook, Twitter LinkedIn etc etc. And phone tells me there are contacts that he can hook up together when he finds a contact in my Google account that is also in my Linkedin. But when I factory reset my phone, this proces happends all over again.

My question is: How can I make those connections permanent so they get stored in my Google Contacts?