Facebook's tentacular reach across the internet was accelerated by its 'like' button, which now seems a ubiquitous part of the browsing experience from news and blogs to corporate and retail sites. By late April, the like button had been added to 250,000 sites outside Facebook, feeding information back to the site on the activity and preferences of its 650+ million users. Though third-party buttons have been around for years (Digg this! Wordpress that!), the scale and recognition of Facebook's like button hasn't escaped the notice of Twitter and Google, and both are introducing rival (or perhaps complementary) buttons this week. Twitter's new follow button on the CNET site Twitter announced its 'follow' button last night with 50 sites already plugged in, including Huffington Post and the Wall Street Journal. The follow button sits next to a named Twitter user, and lets the reader start following that account on Twitter with one click. The Twitter accoun...
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