For the second time in a row I'm having loads of extra visitors at the start of January. Both times my traffic doubled and traffic quality was very good. This traffic gave the whole site an extra boost when looked at member activity.
The second of January the switch goes on, and someday in February it's switched off. I only get this behavior in January. You can also see in google webmaster tools the visibility increased over this period and drops down again when it is finished.
I would like to know what I can do to get more off these traffic waves? Or if other people have them too?