I can't enter any giveaways today. All say duplicate entry. I'm sure I have not entered them all. I haven't entered 0 level giveaways in a long time and even they say "duplicate entry". Things were ok yesterday.
Added 2 giveaways, counted as 4 (2 of them happened when i tried to add a game that i couldnt at that time). Got 0 xp, 0 feedbacks from the guys that won. looks useless to a newcomer honestly...
If winners don't leave feedback it can take a week before you get the xp. If you still don't have any after that (and didn't get negative feedback) you can contact support about it.