Yes and no. A long time ago, Google stopped showing search term keywords in Google Analytics for its logged in users. You can read about it online. Most of your traffic may be from logged in Google users so it will hide their keywords searched and show up as "not provided". Rest assured, we are sending the traffic that is using your keywords and the service will work the same way regardless.
SEO: Search-engine optimization (SEO) refers to everything you can do to make your website more visible on search engines like Google. The majority of web traffic comes from people clicking on the first few unpaid search results that come up in a search, so it can be a very valuable tool. To find out what you can do to improve your site’s SEO, see our post on SEO Basics.
No, unfortunately we can not guarantee that the absolute safety of Google Adsense Traffic. This is because we have seen instances in which websites were penalized for receiving large bulks of traffic (and clicks) to their Google Adsense ads. Therefore, if you use it, we strongly recommend you to use it in moderation and in conjunction with other traffic sources. More information >>