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It depends what do you expect, set your goals, plan how to execute it and when you can expect ROI. The best what you can get are leads I would say.
It really depends on what targets you set for yourself.
Digital marketing is simply a new platform for marketing, hence if your intention was market penetration and you achieved it, that's an excellent ROI. (that can be gauged by pr-defining the number of users you wish to reach etc)
