Ask questions and give people the most helpful answer. Respond to a few questions each time you're online. Answering will earn points, and if you get the most helpful answer it will earn more. You'll see, the more time you invest in it, the more points you collect.
And, you'll start hearing the same people over and over again and they'll more or less become friends. Enjoy "GAG'ing"... generally it's fun.
nope i does not randomly increases..just check it in your settings
You can earn points by being an active member of the site, providing helpful opinions, asking questions, etc. You can cash in those Xper points for rewards, like Amazon giftcards, feature questions for 24 hours, donations to RAVEN, etc.