I don't think website visitor counters which show the number of visitors to a site are useful to visitors these days.
But, invisible counters/visitor analytic tools like Google Anylitics, Statscounter, and Alexa for collecting visitor numbers, and other stats like refferal links, and bounce rates are useful for web masters, and website owners since these tools tell you where your visitors are coming from, what pages they view on your sites, and how long they use your website for.
But, invisible counters/visitor analytic tools like Google Anylitics, Statscounter, and Alexa for collecting visitor numbers, and other stats like refferal links, and bounce rates are useful for web masters, and website owners since these tools tell you where your visitors are coming from, what pages they view on your sites, and how long they use your website for.