To be clear, the platform does not support "short selling" of the shares in another member. So, there is no effective way to deliberately drive down the reputation of another member.
Shares are traded in a fixed size of 100. Each BUY transaction increases the share price by 0.01. Each SELL transaction, reduces the share price by 0.01.
When you join the service, shares in your profile become available to trade by every other member. Members discover each other primarily based on services offered/needed. Today, if you like someone on a network, you might choose to "follow" or "like" them. We offer an alternative, whereby you "invest" in them.
A follow or like from you to someone else makes the connection and allows you to view their network activity. An investment on SELLFF does the same "and" allows you to benefit from any upside in the value of that investment. As the person you invest in goes up in value, so do you. Not a bad situation really.
Anytime you like, you can BUY or SELL more shares. The exchange is open for trading 24 x 7.