PUP.Optional.Wajam is the detection name for Wajam, a browser add-on marketed as a “social search.”
PUP.Optional.OnlineIO is the detection for a small family of browser hijackers that also emails spam if they have your address. They are named after the domains these hijackers hail from which is also the name of one of their sub-folders.
This PUP is installed by bundlers. These bundlers typically offer one software for free and include others in the same package. They get paid for every successful install.
Malwarebytes removes PUP.Optional.OnlineIO completely. No extra steps are required. A complete removal guide for Traffic Exchange, which is a member of this family, can be found on our forums.