My site was ranking for many long tail keywords but this friday they all dropped at least 20 to 30 points, some not in top 100 either. I checked by searching my URL in G! and it shows up. I created some new pages and did my usual social network blast and those two new articles showed up in top 2 immediately. But all keywords that I was ranking in top 5 are now simply vanished or dropped face first. I received no messages in webmaster tool. Was there an update this friday? Anyone else got hit? Should I continue building links or give up and start over?