Not entirely sure what you are asking.
You might be interested in Buzz Sumo - this is a useful tool for finding influencers and active social media accounts within a specific niche or topic.
Being frequent and consistent in your social media posts is important to build up brand recognition.
There are a bunch of tools and tricks but there really is no substitute for actively engaging in a community. Its so much more valuable in the long run. It doesn't happen over night.