Tumblr raises another $5 million from Union Square and Sparkhttp://techcrunch.com/2010/04/20/tumblr-funding/?utm_source=direct-gri.ms&utm_medium=gri.ms-twitter&utm_campaign=Feed%3A+Techcrunch+%28TechCrunch%29&utm_content=twitterfeed by mhunter • 16 years ago 2 0 16 years agoTEtechcrunch.com