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Did they just remove it once it became popular and everyone related names like eBay, Facebook, Google to their equivalent? i.e. Online Market, Social Network, Search engine
Any thoughts on that?
I guess I shouldn't add a slogan to my new website that im developing especially if Im gonna compete with those big guys! ;)
why does Google and Yahoo not have one?
Because they offer so many different services and in many different countries and spanning many languages, it wouldn't be viable to have an all encompassing catch phrase.
To my thinking, your "Slogan" is the most important statement describing what your site is about. Should be there and perhaps is your <h1> tag
From an SEO perspective, I wouldn't unless it showcases the specific keywords that you are going after for that specific page. Otherwise I would reserve the H1 tag for keyword titling of specific pages.