Recently, there has been an online discussion of WeChat function -- a way to delete contacts that you have not messaged for a long time. Today, WeChat launches this function officially in the latest 6.5.13 version!
Actually, this is a useful way to remove "one time contacts" that you may have added but never messaged.
How To Set Up?
Step 1
Open your WeChat - Tap "Me" - "Settings"
Step 2
Tap "Privacy"- "Infrequently Contacted Friends"
Step 3
Select Filter of…
■ No one-to-one chat messages within last 6 months
■ Not in the same small group chats
■ No comments to their Moments within last 6 months
After that, there will be a contact list of the filter you choose and you now can delete these not-often-contact friends! 
These methods allow users to quickly and easily remove inactive contacts. No more going through the contacts list and removing users one by one.
Please Pay Attention
This function is according to your chatting records. So if you have deleted your WeChat chatting records, WeChat will predicate your friends to the list of "No one-to-one chat messages last 6 months" by mistake.
Currently, this function will be launched in batches. If you can’t find this option, please update to the latest WeChat 6.5.13 version and wait patiently.
For the Android users, you can reply "001" to HACOS and get the latest beta version to try this function.
You must want to hurry to see who are your not-often-contact friends! 
Just share with your friends!
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