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To be able to reply to that question we would need to know: Who is the target group?
In my opinion we cannot just focus on 'regular' social media users, for instance, since they would miss many funtionalities they do have on their current platforms. steemit attracts bloggers, people who are interested in earning money by distributing content (not simply 'status updates') and perhaps already do that on other platforms. People who have already a certain experience with content creation and its monetisation.
That´s why I would especially focus on already existing blogger networks and communities (ONLINE / web) and places where we find people with a high affinity for writing, journalism etc. like universities, publishing companies and their corresponding magazines /media (OFFLINE / print).
Considerable growth means recruiting masses - and that means: money. If we wanted to do a really effective ad campaign, we would need a certain budget. Let´s see if the roadmap announced by Dan and Ned will include that point. In my very personal opinion it is impossible to raise a new brand without a bombastic launch campaign. Unless you have an absolutely unique idea or product which does that job by its own. But that would something to happen during the very first weeks or months - and not after having the product in the market for more than one year...
I would furthermore try to cooperate with a handful popular bloggers, 'using' them as ambassadors for steemit representing 'successful blogging' in relation with steemit, spreading the idea amoung their already existing communities. But that last point would be something additional - not directly related with the campaign.
For a start we can all share the idea amoung our friends, motivate our families to join and link our blogs in other (social media) networks. That won´t generate huge growth, but it is at least a little contribution.

Most of your ads in this post highlight a relatively inexpensive item or routine cost, the exceptions being the laptop, camera and most definitely the tattoos :) they can cost tons. But still not incredibly expensive wants and needs. In the Adwords world, you would probably geo target male or female, 16 to 35, and those that have searched specifically for the items in the pictures. But then you'd be paying for the ad clicks.

Hmmm, I am not sure if a person who is looking for a computer would be happy landing on steemit... But talking about Adwords: I have a campaign running for my own steemit blog right now - just to test how it works. The key words I defined are e.g.: personal blog, blogging, content ditribution, etc. Let´s see if/how it works. And yes, I am paying for every click :) That´s what I meant when I mentioned the 'needed budget'. Let´s see if Steemit Inc is willing to invest something here. I think it is the only way to acquire a significant amount of new users...

Your landing page shouldn't be Steemit, it should be a page on your own site that explains why Steemit is a great place for someone interested in a computer and might be interested in a platform where like minded individuals could help them earn money to cover the cost. Also a landing page tailored for each ad and focussed on what made them click the image is a way to split test your results. But there I go again, talking about people having their own website.

Do you have your own site?
I have started the adwords campaign to generate traffic for my blog on steemit since I don´t have any other website with many followers from where I might bring some new users. I wish I could do it like that!! :))

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