I am already using social media website like Facebook Ads and acquiring customers but I am not sure how can I increase my customer base by using Google SEM.0 likes
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Depends what is your industry. For some having $10 a day could be enough, for others $1,000 are not enough at all.
Definitely, as stated before, having a well optimized website will massively help AdWords to perform even more.
What type of business are you into?
Try advertising with Adwords with Small budget. Compared to Facebook ads, Adwords will give you best results interms of Sales or Leads.