I can confirm this bug. In my case I have the VPN down through which most 
accounts I access (Facebook, gtalk, icq). When empathy starts it immediately 
eats up 100% CPU (telepathy-gabble) and continues to do so even if I set it to 
offline.
An strace on the telepathy-gabble contains polls and empty receives only:

poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
recvfrom(11, "", 6, 0, NULL, NULL)      = 0
recvfrom(10, "", 6, 0, NULL, NULL)      = 0

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to telepathy-gabble in Ubuntu.
https://bugs.launchpad.net/bugs/1085167

Title:
  telepathy-gabble using 100% cpu

Status in “telepathy-gabble” package in Ubuntu:
  Incomplete

Bug description:
  telepathy-gabble using 100% cpu when the chat is connected and network
  down or change another network

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: telepathy-gabble 0.16.1-2
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  Uname: Linux 3.5.0-18-generic x86_64
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  Date: Fri Nov 30 13:07:29 2012
  ExecutablePath: /usr/lib/telepathy/telepathy-gabble
  InstallationDate: Installed on 2012-10-24 (36 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  ProcEnviron:
   SHELL=/bin/bash
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
   LANGUAGE=es_MX:es
   LANG=es_MX.UTF-8
  SourcePackage: telepathy-gabble
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/ubuntu/+source/telepathy-gabble/+bug/1085167/+subscriptions

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