Hi friends if you have good knowledge on a topic you can earn good maount from bitwine.
BitWine allows people to give advice on their topic of expertise by video-chatting. Here’s how it works: BitWine advisors download the BitWine Taskbar and create a profile. In order to start receiving calls from clients, they login and set their account to active. Advisors set their rate and can decide when to start charging a client during a session.

Clients pay directly through PayPal and may also schedule an appointment in advance. BitWine is still in beta period and is therefore currently not charging any fees.
http://www.bitwine.com