As you scroll through the threads on Reddit, you may find that some people are complaining about an element of Steam which may be down. Maybe the Steam store is bogged down or maybe there are some issues at the moment in DOTA 2. Rather than scrolling through threads looking for what may not be functioning at the moment, you can take a quick peek at the Steam Status service.
SteamStatus is a website which keeps you in the know regarding everything Steam. By visiting the site, you will instantly know if the services displayed in the image above are running as normal or if they are having issues at the moment. In addition, you will see how many users in total are currently using Steams service. SteamStatus updates every minute so you can consider it fairly reliable.
Link to SteamStatus service.