I believe there are lots of platforms, which would be useful for e-marketing for example Research Gate to attract researchers, Linkedin to attract professionals in business arena including university levels. Furthermore, facebook, google ad and so on could be effective platforms for e-marketing..
There are plenty of impressive online marketing tools we can use to help create a more effective solution. In general, I think the most effective e-marketing tools include Facebook, Google Ads, Adwords, Google Analytics, and MailChimp.