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Steam adds more functionalities to demos. Demos can now have their own page and reviews
(store.steampowered.com)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
I think just having a tab (just below the game description) showing reviews and rating for demos and for the full game, without having a dedicated app ID, should be enough.
Oh yeah, definitely.