It depends on the kind of startup and who your target customer is. If your startup sells directly to individuals, you could use social media to target your target demographic by showing them relevant ads, promoted tweets or by directing them interesting news articles.
If you startup sells to business, targeted advertising on LinkedIn, doing webinars and trade shows are the way to go. In some instances, cold calling might also work. Cold calling must be your last options, it could backfire badly if it doesn't work.
Report Praful's answer
Maximize Free Social Media Utilities to Promote Your Small Business. The process requires a front-end loaded investment in time, but it is well worth the effort when using free or very low cost utilities on the Internet. The return may surprise you. Set up a Google or Word Press blog as an extension of your web site. A blog is quite different from a web site. Provide good, solid information free of charge and use blog searches for synergistic businesses to team with. Be prepared to provide information, samples and valuable service gratis as a marketing tool. Introduce yourself and then immediately engage the client or potential teaming partner with your presentation tools available to bring your expertise to whatever topic they are interested in. Link everything together and begin answering questions as well as registering at many of the free applications for networking web sites on the Internet to see how that can benefit your product and services. Utilities like Twitter, Alignable, Pinterest and About Me will serve your site well. Integrating and networking platforms together is the best approach. Most of the free applications of the type discussed here have profile features to link back to your blog and many will automatically publish your content on their site, once linked. For further details please see: * https://www.smalltofeds.com/2015/04/maximizing-free-social-media-utilities.html **
Report Kenneth's answer
Creating a free tool that will be useful for your target market and then promoting that tool instead of directly promoting your company can be effective. One example of this is HubSpot promoting https://website.grader.com/ when they first started. Don't know your business, but think about the possibility of doing something in this direction. Giving value at the first point of contact works better than asking for something.
Report Niraj's answer
The use of social will enhance your targeted audience because it does cost much.It is closest means to communicate to the people .
Report Henry's answer
Do a podcast, go on other podcasts, attend a Startup Weekend event near you https://startupweekend.org/, go to meetup groups in your area, social media, create a blog, ask your family and friends to spread the word, visit a local business, find a group of people that the startup product or service will benefit from and do a questionnaire, create a free webinar. Good luck.
Report Kim's answer
Can also do surveys on twitter, instagram, fb to see if there is a need for your product and or service. Depending on what your startups is, you can find local college students to help and be your brand ambassador and leverage social media on campuses too. Make sure your website, app are up to date and provide simple, spelled out details of your product and or service.
Report Kim's answer
Know your target audience - and what media they are using. Are they using Twitter, Instagram, Facebook - if so, advertise on those platforms. If they are older, then social media may not be the best format to reach them. If you are relying on a digital space/website, then ensure folks are able to easily find your site via search terms. How are your competitors promoting themselves - how are they reaching their target customers - how are they advertising their business?
Report RAYMOND's answer
word of mouth of course but social media gets the word out there faster