Sites like omgcafe yahoo
Site owners who install the Alexa Certify Code on their website can choose to display their Certified Metrics, such as Monthly Unique Visitors and Pageviews, if they wish.
For other sites, we display the estimated number of unique visitors from up to 6 countries, when sufficient data is available (Advanced plans only).
Possibly the web server is down, overloaded, unreachable (network problem), or a website or server maintenance is in progress right now.
This means that the website is currently unavailable and down for everybody (not just you) or you have entered an invalid domain name for this query.For these sites, we show estimated metrics based on traffic patterns across the web as a whole.We identify these patterns by looking at the activity of millions of web users throughout the world, and using data normalization to correct for any biases.Daily Time on Site Estimated daily time on site (mm:ss) per visitor to the site.Search Traffic The percentage of traffic, both free and paid, that come to this site from a search engine over the past 3 months, updated daily.