Effective immediately, eBay will first warn, then suspend, members who use their eBay connection to conduct business offline. For example, it is against eBay rules for a person to contact a losing bidder on eBay to offer that person the same product without going through eBay

Also beginning immediately, anyone who uses the Shack messagecenter to contact other Shack users will no longer be allowed to send messages to that user outside of messagecenter (read: email). I'll catch you punk!