When should a company begin to market their game?

In case the game is in the early stages of development, what can be posted in social media such as Facebook and Tweeter in order to maintain updates 3-4 days per week?

I made a list of possible content that a post or a Tweet can have:

It will depend on the game and the group making it.

Frequent communication with your customers is good, especially when coupled with frequent additions and updates.

Exactly how frequently, exactly what to include, exactly where to post, those are unique to every project.

If you are making a press release 3-4 times per week you better be putting out significant new content at least weekly. That level of communication is spamming pretty hard, and even customers who want to know about your updates likely don't want that much information.

When should a company begin to market their game?

In case the game is in the early stages of development, what can be posted in social media such as Facebook and Tweeter in order to maintain updates 3-4 days per week?

I made a list of possible content that a post or a Tweet can have:

Updates of game scenery, new characters with bio

Question about previous updates, feedback

Game development such as artwork and sometimes game trailer, soundtrack

Photos of people from the develop team working

Games such as guessing on an image of a future update of the game.

Competitions with other social media such as Snapchat or anything related to Reddit or Hashtag in Tweeter

Discuss about game events.

There's no set formula here. It's not like 'insert random game, apply these 20 steps, profit from sales'.

Each game should have a well tailored strategy, and ideally no strategy at all: if you have something to talk about (hopefully) mention it.

My general advice however is to have a personal twitter account as early as possible (not bearing the game's name mind you, it needs to be an actual person sharing opinions, not just news about their upcoming title).

Take a look at the marketing guide at pixel prospector.

http://www.pixelprospector.com/the-marketing-guide-for-game-developers/