Where are all the new members coming from?

In the past week or so I have noticed a large amount of new members (much more than I usually notice). The last time I recall there being this many new members was when a number of us, myself included, migrated from wis.dm. Have these new members migrated from another website, is it just a coincidence that we have so many new members all of a sudden or do we usually get this many new members on a weekly basis and I just have had my eyes shut all this time (My dad calls me Mrs Observant in a vey sarcastic tone so the latter is highly likely!)