You don't even have to really invite them, just click there name and the screen comes up then back out of the message screen and your points are still there, it give you the XP once you click there name,
On another note I got -5 on the Masters portion of the demo, which gave me something like 2600 points so I currently have 4300 XP, and I have only played the demo like 2 or 3 times.
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