This month, we had the pleasure of hearing Jaime Bellmyer talk about building his Grabicon service. Most of the presentation can also be read on his blog here: http://www.rubycuts.com/2015/01/ditch-googles-blase-favicon-service-grabicon-loves-you/
He's really pushing right now to get more developers using the service, and the basic access level is free and allows for up to 2,500 requests/day. So if you're building an application that regularly links to other external sites, consider using Grabicon to pull favicons for those sites. He showed how gemerald.com, a small search engine site he built, displays the search results including these favicons and I really liked the effect. That single visual cue makes it so easy and fast to identify where that link will take you.
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