I'm curious in your daily surfing what are the most common SEO mistakes you saw on people websites.Let's make a big list, and learn from it.
I'm a frequent article marketer, and I just feel a little...awkward, to say the least, when I see people submitting their articles on directories without anchor text in the link to their site. Instead they just have their URL. That's just me though.
The worst SEO I have seen was by a self-claiming SEO professional. It nicely keyword-stuffed in meta tag like; SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO, SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO,SEO, They also used a frame at the bottom for link exchange purpose, placing people's links in there... It wasn't just a site about SEO. They claimed to be an SEO professional and CHARGING MONEY FOR A CRAP SERVICE!! Their PR was 0 but their service was to help webmasters gain PR... When I checked the site last time, it was already dead.
Do you know some Dmoz pages have more than 100 links? 100 more links on a page DON'T always mean the page is considered as a link farm. Anyhow, the worst I have seen was like...over 1k links on a page, HOME PAGE! c'mon man.
I laughed at a SEO site that had nothing but Google Adsense ads plastered all over the page. That was funny but the funniest part was all the ads pointing to gambling sites. Col
A link farm has nothing to do with how many links you have on a page. Google and most SE's recommend that you keep the number of links on each page to less than 100. So does that mean that having more than 100 links on a page is bad SEO? For DMOZ...probably not since they are an authority site that will still pass a considerable amount of benefit to each of the links. But for all other sites, it is just poor SEO.