Steam is an internet-based digital distribution platform that's made by the American company, Valve Corporation.  It used to distribute games and such media online, ranging small indie developers to larger software houses. In October 2012, Valve expanded to included non-gaming software, like anime.
Role in Gamergate
After Gamergate's successful campaign to push Kotaku's Steam curator off the first page. Operation Gaben was formed with a new goal, to boost the popularity of other pro-Gamergate and pro-consumer Steam curator groups. That way, they can push the anti-consumer curator groups out of the spotlight and give them less sway over Steam's curation.
Gamergate Steam Communities
- GamerGate/ GamerGaters - https://steamcommunity.com/groups/GamerGaters#
- Vivian James Plays - http://steamcommunity.com/groups/vivplays
- Gamergate videogames http://steamcommunity.com/groups/gamergatevidya
Gamergate Steam Curators
Run by Sakuyak, a Gamergate supporter.
- GamerGate Recommends - http://store.steampowered.com/curator/6859671/
- GamerGate Rebooted - http://store.steampowered.com/curator/7701651-GamerGate-Rebooted/
- #GamergateAustralia - http://store.steampowered.com/curator/8981605-GamergateAustralia/
- Microtransaction Macro Fan -http://steamcommunity.com/groups/Microtransactionfound/curation
(Made by reddit user, Dwavenhobble, who is part of Gamergate.)
Communities and Curators Gamergate Supports
- Bro Team Pill - http://store.steampowered.com/curator/3373079/
- Censorship Watch - http://steamcommunity.com/groups/censorwatch
- Cut Content Police - https://steamcommunity.com/groups/cutcontentpolice
- The Cox List - http://store.steampowered.com/curator/6863163-The-Cox-List/
- Erik Kain: A Curator and A Gentleman - http://store.steampowered.com/curator/6871210-Erik-Kain-A-Curator-And-A-Gentleman/
- futaba channel - http://store.steampowered.com/curator/222091/
Suggested by 2Chan.
- Linux Gamecast Weekly - http://store.steampowered.com/curator/6856357/
Games from a Linux Gaming podcast. Probably Linux - compatible.
- Hodor Review - http://store.steampowered.com/curator/6861215-Hodor-Review/
- Newsgrounds Games - http://store.steampowered.com/curator/6856292/
- r/pcmasterrace Group - http://store.steampowered.com/curator/4771848-r-pcmasterrace-Group/
- So Old, But Still Gold - http://store.steampowered.com/curator/6856534/
- Super Sekrit /a/ and /v/ Club House - http://store.steampowered.com/curator/3824785-Super-Sekrit-a-v-Club-House/
- RedditTwoXGaming - http://steamcommunity.com/groups/RedditTwoXGaming