In Google Reader you can choose to either sort by newest, oldest, or by "magic". What exactly does this last option mean?
put on hold as off-topic by Jacob Jan Tuinstra, jonsca♦ 6 hours ago
This question appears to be off-topic. The users who voted to close gave this specific reason:
It sorts feed by looking at item you have previously starred, shared or liked.
More info here;
hope this helps.