 As different mediums emerged, such as social media, where celebrities could voice their opinions on various topics, their influence had a greater effect.Mark Wheeler has opined that this led to one of the main critiques of celebrity involvement in politics in that celebrities could be viewed as a manufactured product, one fabricated through media exposure.Celebrities such as movie stars, professional athletes, musicians, and reality television stars have campaigned for and against political parties, candidates, and on political issues.