Snapcaht is a popular chat software, this article will guide you to block snapchat in WFilter 4.1 .

Step 1. New a blocking level in “Policy Settings->Blocking Levels”, click “Edit” in Applications tab:

Step 2. Deny snapchat protocol and save setting:

Step 3. Apply this blocking level to computer:

Step 4. Visit snapchat website and check result:

Step 5. You can see blocking records in “Current Online->Real-time Blocking”: