Niche: the situation in which a business's products or services can succeed by being sold to a particular kind or group of people or a specialized market Size

Niche: the situation in which a business's products or services can succeed by being sold to a particular kind or group of people or a specialized market Size is not necessarily a function of the word niche it only implies that the good or service being sold targets a group that is not a majority of all of the market participants. In twitters case 3.4B users on the internet, with only some subgroup that participates on social media and then only a subgroup of that group that wishes to participate with limited post length and then, business wise, just the business niche that have a large customer base within that subgroup of internet/social media/short form. As an example BMW is a niche business, luxury auto, that had 92B in revenue last year.