There are several companies which are involved on the tech side, such as Modulate AI and Spirit AI. Source: about 3 years ago

If you ever feel like trying your hand at it, clickworker.com is a site where you can register and get access to UHRS, were most of these jobs are around. Source: 12 months ago

At your request, we have deleted your account on clickworker.com. After a waiting period of 40 days, your data will be permanently deleted or made anonymous. We will only keep the data required by law (e.g. invoices). Source: over 1 year ago

I had my account temporarily suspended a couple weeks ago. "Routine security checks found that you have simultaneously used several accounts on clickworker.com." Of course this is ludicrous as I just have the one. When I responded to the email, which came in the middle of the night, it said the ticket had already been closed because I hadn't responded. So, I opened up another ticket to dispute the bogus claim... Source: over 1 year ago

Edit: site is not down any more. Please go to clickworker.com and sign in. Update your bookmarks to the new dashboard URL. Thanks for pointing this out /u/randir14. Source: about 2 years ago

Clickworker (Signup Link): Clickworker has several data collection opportunities from time to time, though they are very infrequent. You are paid 30 days after the approval of your submission. Source: over 2 years ago