"Safari" is the app that does the browsing.
"com.apple.Webkit.networking" is the app that works in the background doing things like the icons refresh. Some other applications also use this "channel" (app) to reach out, and I usually have it on "Deny all". I like it better when apps do their own connections and don't hijack the "backroards".
The only two reasons I jailbreak ALL my idevices(s):
a. Firewall IP
b. Protect My Privacy (PMP)
You literally have no idea what goes in the background when you install and run an app if you don't spy on your phone.
The disgusting part is that even my bank's (NatWest) app, as well as LastPass talk to irrelevant companies when I fire them up, with (my) most hated being Facebook (which is of course blacklisted and added on my hosts file).
For my Android devices I always run "NoRootFirewall" which is a pretty good firewall.
Edit: Both FirewallIP (iOS) and NoRootFirewall (Android) have logging mechanisms so you can track what goes in/out and what is rejected. I am really looking forward to a NoRootFirewall-app for iOS. Something that creates an internal VPN allowing you to manage it.