It's been a busy week for companies like Google, Yahoo!, Tumblr, and Twitter, and as a result, some noteworthy changes are coming your way. With new developments like Google's latest Penguin algorithm update, Yahoo!'s acquisition of Tumblr, and Twitter's new Lead Generation Cards, marketers have got a lot to catch up on. But we've got you covered. Here's what you need to know about all the important news in marketing this week.
