Steam users can now link their Steam account with Twitch – http://twitch.tv to not only broadcast their games but earn tournament item drop by watching broadcasts.
The DOTA 2 Blog goes on to explain why you might want to link your accounts.
This link makes you eligible for tournament item drops while watching Twitch streams as long you own the ticket for that tournament. We realize that people have different reasons why they prefer to watch in game or via streams and wanted to bridge the gap of features they were missing out on by choosing the service that works for them the most. We hope to expand on the features available via this system and would love to hear what you think we should work on next.