Spend as much time as possible on, but don't let it consume you. The more you use it the easier it gets, but don't let it be all you do.

there is more of a learning curve than other social networking sites.

Think of Plurk like a site of only Facebook status updates. It works pretty much the same way.

Its seems like a fancy twitter.

Both Twitter and Plurk are microblogging sites. So they are both the same kind of thing, they just do it a little differently.