I currently do SEO (inhouse) for a multinational site concentrating specifically on 11 sub domains. Now we've seen the increase in Not Provided traffic grow steadily over the last year but now the average is over 35% with two of them hitting over 50% in March, Finland and Poland. Finland was the most unusual one since it was 39.5% in February and now 53.4% in March.
Has anyone else seen such a dramatic increase with their sites?
I haven't seen a jump like that in one month but when there is a new browser upgrade I have seen faster increases. Of course the increase varies for each of my websites since each of them have different audiences.
Firefox and Chrome now force SSL search on the google homepages and search so people who use these browsers will not provide the keyword information. Try sorting not provided by browser. you will see an increase on ff and chrome near the end of last year.