A “gig” in the online world is small work or projects you do as a freelancer using a particular online marketplace as a means to find work, book clients and get make money online. This work pays quite well ($25+/hour is quite common) is quite varied, including copywriting, painting, cleaning, software/website development, computer support, translations, putting together furniture, carpentry work and a lot else. This can be a great online side hustle for college students.
When organizations need have an online forum or social media presence they need someone to moderate it. When they don’t have internal staff to do this, they outsource it to moderators firms. These firms then hire freelancers or part-time/full time employees as moderators to manage the forums/social media for their clients.
Online research companies are contacted by businesses who need research into different areas. As an online research assistant for these sites, can make a good money answering these questions.