Random thoughts from someone with a lot of business experience but not with that exact business:
Paypal made it by taking eBay, becoming what "everybody uses" on ebay. Who exactly are you marketing to? If you plan for people posting on forums to use the service, pick a couple forums and become THE service everyone on that forum uses.
Even better if you can get integrated with some forum software or something.and becomes THE image host on sites using that software.
SEs don't have the same community / word of mouth, so with SEs I'd focus on a specific community at first. As a random example, if marketing was targetted to new moms with baby pics (postyourbaby.com), you would get word of mouth on thenest.com and similar sites. Make a copy postyourschematic.com targetted at geeks and you could own the geek market.
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