There is no minimum or maximum. Our Facebook Ad agency is used to working with budgets ranging from $300/month to over $5000/month. However, you should know that certain factors influence the minimum budget you should invest if you want your Facebook ads to be successful: geographical area, type of audience, chosen objectives, number of leads, website visits, sales etc.Likewise, it is important to distinguish between the budget you invest in Facebook and the "human time" involved in the creation and management of your campaigns. Whether you decide to entrust the project to a Facebook ad agency such as My Little Big Web, do it yourself or ask one of your employees to do it for you, you have to factor this time into your ROI projections.Call us or send us a message so that we can give you a personal assessment.